Choose the best option to replace the underlined part to improve the given sentence. If no substitution is required, select 'No substitution.'
She is good in painting but weak in studies.
Show answer & explanation
Correct answer: A
Explanation
The correct preposition to use when expressing proficiency or skill in an activity is "at". The phrase "good in" is generally incorrect in this context; "good at" is the standard idiomatic expression in English for describing a person's abilities or performance in a specific area.