PLEASE HELP!! The sentence below is a mixed construction. Choose the version of the sentence that corrects the error.

An arabesque is when a ballerina stands on one leg and raises her other leg in a straight line to the back.

a) An arabesque is where a ballerina stands on one leg and raises her other leg in a straight line to the back.

b) When a ballerina stands on one leg and raises her other leg in a straight line to the back is called an arabesque.

c) For a ballerina standing on one leg and raising her other leg in a straight line to the back is called an arabesque.

d) An arabesque is a ballet position in which a ballerina stands on one leg and raises her other leg in a straight line to the back.