<em>If abominate means “to hate or loathe intensely,” abominable means </em><em>A. capable of being hated; disgusting.</em>
Explanation:
<u>Abominable</u> is an adjective that expresses that something can cause revulsion or that it is highly unpleasant. In this case, <em>his behaviour at the party</em> was worthy of disgust or hatred, and was detestable. That is why the word <u>abominable</u> was chosen.