cloak-and-dagger

Options

A. an armoured suit
B. a game of martial skill
C. an activity that involves mystery and secrecy
D. a wide coat without sleeves and a small sword

Answer

C

Explanation

cloak and dagger : activities that are secret and mysterious. sometimes in a way that people think is unnecessary or ridiculous. Look at the sentence : Why can.t we be open about it? Do we really need all this cloakand-dagger stuff? Here, an activity that involves mystery and secrecy is the right option.