She is one of the engineers who works in Bangalore.
Awhich works in Bangalore
Bwhom works in Bangalore
Cthat works in Bangalore
Dwho work in Bangalore
Answer & Solution
Correct answer: D. who work in Bangalore
1. 'Who' refers to plural 'engineers' → 'work'.
_Source: 501-GMAT-Questions Ch 3 Sentence Correction_