Select the word OPPOSITE in meaning to the underlined word.

The thief showed his disbelief when informed that his partner had been arrested.

concealed

The correct answer is Option (2) - concealed

Here's why:

Displayed : This means to show or exhibit something openly. It directly contrasts with "disbelief," where the thief is revealing his surprise through his actions.
Battled : While disbelief can sometimes lead to arguing or resisting, "battled" suggests a more physical fight. Disbelief is a state of mind.
Marked : This word has various meanings depending on the context. In this case, it doesn't provide a clear opposite to disbelief.

Therefore, "concealed" is the most fitting option. It means to hide something, which is the opposite of how the thief reacted to the news (showing disbelief).