Nate is just learning how to swim. his movements are spastic and he is always splashing water on the lifeguard based on this we can nate needs improvement on his: ) efficiency.
b) consistency.
c) flexibility.
d) hand-eye coordination.

(A) Efficiency

Explanation:

According to the given question, Nate is start learning swimming and he needs improvement based on his efficiency as it is the ability for producing the desirable result by avoiding all the negative circumstances.

As, Nate always splash water on lifeguard during the swimming so that is why he improves his performance more efficiently.  

The efficiency is the process that reduce or avoid all the unnecessary resources like physical material and helps in achieving the high result. Therefore, Option (A) is correct.

are there any options?