Question

For some days the new professor lectured above the heads of his pupils.
A.over the head of
B.over the heads of
C.on the heads of
D.through the heds of

Answer 1

for some days the new professor lectured over the heads of pupils.

Answer 2

Option B. over the heads of -This is the right answer.

About choosing the right answer:

• We must check if there is agreement among the parts of speech in it. That is the subject and verb should agree in person and number.
• We have given a few options, out of which the right answer must be sorted out.
• We have to check whether the prepositions are used properly.
• The phrase 'above the heads' is wrongly used. We have to choose the correct option.
• Option A. is incorrect because 'head' is singular, but 'pupils' is in plural.
• Option C. is wrong because 'on the heads' means 'on the surface of the heads'.
• Option  D. 'through' is also incorrect because, it means passing inside and coming out. It is meaningless.
• Option B. 'over the heads of' is the right answer.