Aim of social study teaching is:

Concept: The aims of teaching Social Studies (History, Geography, Civics and Economics taught together at the school stage) are recognised in pedagogy as multi-dimensional, not singular — the subject is designed to simultaneously build (a) national integrity and international understanding, (b) qualities of good citizenship, and (c) appreciation of one's cultural heritage.

Application: Checking each option against this framework:

• development of national integrity and international understanding is one recognised aim — it helps learners see themselves as part of both a nation and a wider world community

• becoming a good citizen is a second recognised aim — Social Studies builds civic awareness, rights, duties and responsible participation

• development of cultural heritage is a third recognised aim — the subject preserves and transmits a society's history, traditions and heritage to the next generation

Since these three are complementary goals pursued together rather than mutually exclusive alternatives, the question — which asks for 'the aim' in general, not for a single primary aim — is best answered by the option that captures all three together.

Cross-check: If only one of the three were intended, the other two statements would have to be false as aims of the subject, but each is independently affirmed in the standard pedagogical description of Social Studies teaching — confirming that endorsing all three together is the correct reading.

Result: All of the above is the correct answer.