Members of the Rajya Sabha are elected by the:

Article 80 of the Constitution fixes the composition of the Rajya Sabha: twelve members are nominated by the President for their special knowledge in art, literature, science, and social service, while the remaining members represent the States and Union Territories. Under Article 80(4), the State's representatives are chosen by an electoral college consisting of the elected members of that State's Legislative Assembly, following the system of proportional representation by means of the single transferable vote.

Applying this rule here: it is only the elected members of a State Legislative Assembly (any nominated members in an Assembly with such a provision are excluded from this electorate) who cast votes for that State's Rajya Sabha seats. Each MLA ranks the contesting candidates in order of preference on a single ballot, and a candidate must reach a fixed quota of first-preference and transferred votes to be declared elected — this indirect, preference-based mechanism is what makes the process 'proportional representation by single transferable vote' rather than a simple majority poll.

Checking this against each of the other groups named in the options confirms there is only one match:

• The general public directly elects, by universal adult suffrage, both the members of the Lok Sabha and the members of the State Legislative Assemblies (as well as local-body members); it is these two categories of directly-elected representatives that the public chooses, but the Rajya Sabha's own composition is deliberately kept indirect, so the general public casts no direct vote for it.

• Lok Sabha members take part, together with the elected members of the Rajya Sabha and of the State Legislative Assemblies, only in the separate electoral college that elects the President of India under Article 54 (a category the Seventieth Amendment, 1992, extended to include the elected members of the Delhi and Puducherry Assemblies) — but Lok Sabha members themselves cast no vote to fill a Rajya Sabha seat; that is a distinct process reserved for a State's own Assembly.

• Members of a State Legislative Council are, where such a Council exists, themselves returned through an entirely separate mixed electorate under Article 171 — one-third elected by the State's MLAs, one-third by local-authority constituencies, one-twelfth each by registered graduates' and teachers' constituencies, and the remainder nominated by the Governor; the Council plays no part in the Article 80(4) electoral college for the Rajya Sabha.

• Elected members of State Legislative Assemblies are exactly the electorate Article 80(4) names, so this is the correct match.