Spot an error in the given sentence. (A)No one /(B)is interested in worshiping…

Rule: A noun that refers to a specific, already-identified group (rather than to people or things in general) must be preceded by the definite article 'the'. This applies to collective nouns such as 'youth', 'poor', 'rich', or 'aged' whenever they denote a particular class being discussed in context, not humankind in general.

Here, 'especially youth' is meant to pick out a specific group — the young people of today — not youth in general, and the sentence has already narrowed the scope with 'these days'. So this is a definite, particular reference and needs 'the' before it: it should read 'especially the youth.'

Checking the other three parts confirms none of them carry an error:

• 'No one' is a correctly used indefinite pronoun subject; it needs no article.

• 'is interested in worshiping of deities' states a general practice (compare 'worship of nature is fading') and so does not need 'the' before the gerund; no article or preposition is missing or misused here.

• 'Gods these days' needs no article before the plural, generic noun 'Gods', and 'these days' is a standard adverbial phrase of time.

So the error lies in part (D): 'especially youth' must read 'especially the youth'.