The complete predicate in this sentence is A. mopped his brow, exhaled sharply, and picked up his phone.
B and C aren't correct, because they aren't complete predicates - something is missing.
D isn't correct, because <em>looking up from his computer monitor </em>is not a predicate, it is an adverb phrase.
Answer:
Simon discovers that the so called beast of the island, in really nothing more than the body of a dead airman. He realizes that he has to go and tell the other boys that there is no beast.
<u><em>hope this helps >3</em></u>
Explanation:
Capitals are used for proper nouns.