The sentiments expressed by him in the speech were odious.

Answer: Option B

Significant : sufficiently great or important to be worthy of attention; noteworthy.
Hateful : very unpleasant.
Admirable : arousing or deserving respect and approval.
Common : occurring, found, or done often; prevalent.
Odious : extremely unpleasant; repulsive.

Synonym of Odious is Hateful