Task: Question Answering
Input (English): A rectangle is twice as long as it is wide. If the width is a, what is the length of a diagonal?
(A)\(a\sqrt { 2 } \) (B)\(a\sqrt { 3 } \) (C)\(a\sqrt { 5 } \) (D)\(3a\) (E)\(5a\)
Output (English): C