Answer:
A. To prove that the horse concealed an army of Greeks
Explanation:
Laocoon throws a spear at the wooden horse "to prove that the horse concealed an army of Greeks."
In the story of Aeneas that was written in the book of Aeneid. It was revealed that the Greeks at some point tried some trick on Trojans. One of which was the sending of a wooden horse as a gift of peace.
The gift was seen as a means of ending a ten years war rifts between them. Based on this, the Trojans agreed to accept the gift as they wanted peace.
However, Laocoon suspected the justification of sending the wooden horse and then threw a spear at the wooden horse to prove that the horse concealed an army of Greeks. This was after he had tried to convince Trojans of Greek trickery, but they refused to believe.
