Answer: Option B
:
B
A. Have either of you seen my book?
Statement is wrong .Correct statement is " Has either of you seen my book?"
B. The modern girl gives herself so much airs as she looks ridiculous.
Statement is correct. Correct idiomatic usage " to give oneself airs"
C. It was difficult for me to tell how the thief looked like.
Statement is wrong .Correct statement is "It was difficult for me to tell what the thief looked like."
D. This is one of the most remarkable events that have happened this century. Statement is correct. the verb has to agree with its actual subject "events"