In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option.
Hardly he had stepped out of the house when a tree fell on the roof.

Options

A. out of a
B. Hardly he had
C. when a tree
D. fell on the roof

Answer

B

Explanation

Hardly + Verb + Subject is grammatically the correct structure for the given sentence which is written in the Inverted form. Hence, Hardly had he. will be answer.