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:

The question of abolition of private property is still a moot point.

A undecided

B uncertain

C unknown

D not clear

ANS:A - undecided

No answer description is available.