Loose lips sink ships, so the surprise party planners had to be very what?\nOptions:\n- close fitting\n- careful\n- compact\n- discreet\n- faithful
Please answer the following question by reasoning step-by-step.
discreet
If someone is planning a surprise, they would not want anybody to know about it.

Doing things discreetly prevents people knowing about it.

.

Therefore, the answer is discreet