Answer:
A). He values his own comfort.
Step-by-step explanation:
The actions portrayed through a character(also known as characterization) in a narrative plot always intend to reveal certain values about that character suggested by the author that assists the readers to form an opinion or judgement about him/her and elicit response accordingly.
In the given passage, Squealer's actions 'again able to convince them ...case' reveals that 'he values his own comfort' and for which he ignores the concerns of the animals of the farm again and again. Thus, option A is the correct answer.