Answer :
The correct statement for assigning the value 99 to the last element of a zero-indexed vector named myvector is myvector[15] = 99, assuming the vector has 16 elements. Therefore correct option 2) (15) = 99
The statement that assigns the last element of the vector myvector with the value 99 is not entirely clear without additional context. However, if we assume that myvector is a zero-indexed vector in a programming language such as C++ or Python, the correct statement would be myvector[15] = 99, which corresponds to option 2. This is under the assumption that the last element is the 16th element, given that in zero-indexed languages, vectors (or arrays) start counting from 0. Hence, the 16th element has an index of 15.