The right word to describe Omar's behavior, given the other words' meanings, would be 'misanthropic'. He talks about appreciation for others but acts as a loner, suggesting a dislike of people.
The appropriate word to fill in the blank in the sentence would be E) misanthropic. A misanthrope is a person who dislikes and avoids other people. In the context of the sentence, it presents Omar as someone who presents himself as someone who appreciates other people, but his actions suggest otherwise, indicating he might be misanthropic. The other options do not fit as well: 'A) heterodox' means to not conform with the accepted or orthodox standards or beliefs; 'B) mawkish' means sentimental in an exaggerated or false way; 'C) maladroit' suggests being clumsy or ineffective, and 'D) macabre' refers to an unhealthy interest in disturbing and unpleasant subjects, especially death or disease.
Learn more about misanthropic