Idioms and Phrases - Verbal and Reasoning

In the following questions four alternatives are given for the idiom/phraseitalicised and underlinedin the sentence. Choose the alternative which best expresses the meaning of idiom/phrase.
Q1:

He has built a big business empire by his sharp practices.

A extreme hard work

B keen business skills

C dishonest dealings

D sharp intelligence

ANS:C - dishonest dealings

No answer description is available.