The correct answer is (D) A rendezvous; an appointed place of meeting; an appointment to meet at a certain time and place, particularly one made secretly by lovers.

Tryst comes from Middle English triste (meeting place for a hunt), Old French tristre (station to watch in hunting). It probably is Scandinavian in origin.

Examples of use:

• She was determined to keep her tryst at the botanical gardens.
• He had only a fading recollection of their tryst in the woods.