Answer:
A. Beach.
Step-by-step explanation:
Summers refer to the hot season where there is a need and want to enjoy a refreshing and fun holiday. And with that comes the images of water activities and the sand.
With the sentence talking about enjoying the sea and sun, there is only one thing/ place that comes to mind. That place is a beach where people can enjoy the sea and also the sun at the same time. Skiing is for snow adventure is for exciting places while sightseeing is for exploration of new places.
Thus, the correct answer is option A.