a) in
b) at
c) on
d) of
Correct answer: at
Sentence : She is good at painting.
Option-by-option explanation:
a) in – “Good in” is not correct in this context. It’s rarely used except for places (“good in class”).
b) at – This is correct. We always use “good at” to talk about a person’s skills or abilities. Example: good at dancing, good at English.
c) on – “Good on” doesn’t show ability. It’s used differently (like “good on you” meaning “well done”).
d) of – “Good of” is used to express kindness (“It was good of you to help”), not skill.