We can complete the sentence as "Upon being turned down three times for a promotion, he was so full of unctousness that he separated himself from his..."
First, we must read the sentence to get an idea of the kind of words it will require to complete it. We can see that it will need words that have a negative connotation, since someone who has been turned down three times for a promotion would not be happy.
In that case, the best option is the last one, with the words "unctousness" and "separated." Although uncommon, the word "unctousness" refers to someone who is not cordial or someone who is smug or artificial. The person the sentence talks about has become different after being rejected and now prefers to stay away from his co-workers.
With the information above in mind, we can conclude that the answer provided above is correct.
The complete question with the answer choices is the following:
Upon being turned down three times for a promotion, he was so full of __________ that he _________ himself from his co-workers, opting to work behind close doors.
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