English grammar error-spotting (‘‘Though’’-clause and tense consistency): Read the sentence in four labeled parts (A–D) and choose the part containing an error; select ‘‘No error’’ only if all parts are correct. Pay attention to concessive ‘‘Though …, …’’ structure and present vs. past tense of a continuing situation: ‘‘Though child marriage / has been banned. / the custom still prevailed among some groups in India. / No error.’’

Given data

• A: ‘‘Though child marriage’’
• B: ‘‘has been banned.’’
• C: ‘‘the custom still prevailed among some groups in India.’’
• D: ‘‘No error.’’

Concept / Approach
With ‘‘Though …, …’’ the second clause states a current contrasting fact. Hence a present-tense verb is required for an ongoing situation. Also, punctuation between the two clauses should be a comma (punctuation errors are to be ignored per instruction; chief issue here is tense).

Step-by-Step evaluation
Step 1 (Parts A–B): ‘‘Though child marriage has been banned’’ is acceptable.Step 2 (Part C): ‘‘still prevailed’’ (past) conflicts with ‘‘still’’ (present relevance). It should be ‘‘still prevails …’’

Correction
Corrected sentence: ‘‘Though child marriage has been banned, the custom still prevails among some groups in India.’’

Common pitfalls

• Leaving ‘‘still’’ with a past-tense verb to describe a continuing fact.

Final Answer
the custom still prevailed among some groups in India.