No sé si debo ir a la playa o al cine. a. es mejor que vayas a la playa. b. es mejor que vas a la playa. c. vé a la playa.

a. Es mejor que vayas a la playa.

Explanation: The sentence is:

No sé si debo ir a la playa o al cine.

Which means something like:

I don't know if I must go to the beach or at the movie theater.

The options given are:

a)  Es mejor que vayas a la playa.

b)  Es mejor que vas a la playa.

c) Vé a la playa.

Where options a and b are almost equal, but "b" is not written correctly.

The difference between option a and c, is that a is a suggestion, and c is almost an order.

In this situation, the right option is the polite one, so the right option will be a.

when the outside temperature is too cold, an endothermic animal can generate heat by shivering. endothermic animals must eat much more often than ectothermic animals since it takes energy to maintain a constant body temperature.