Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meanin

Mark the letter A, B, C or D to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

 

Everything seems to be very complicated, and the police have promised to look into the problem.

• A. A. discover
• B. B. examine
• C. C. investigate
• D. D. communicate