Answer :
Final Answer:
The statement that assigns the array's last element with 99 is Option 4: myvector[15] = 99;.
Explanation:
To assign a value to a specific element in an array or vector, you must use the correct index that corresponds to the desired element. In most programming languages, array indices typically start at 0.
In this context, "myvector" appears to be an array or vector, and to modify the last element, you need to use the correct index that points to the last position in the array. Given the conventional zero-based indexing, the index for the last element should be one less than the total number of elements in the array.
Option 4, "myvector[15] = 99;", correctly assigns the value 99 to the element at index 15, which corresponds to the last element in an array with 16 elements.
Options 1 and 2 assign values to the first and fifteenth elements, respectively, which are not equivalent to the last element. Option 3 attempts to use a negative index, which is not a standard practice for accessing elements in an array.
In summary, selecting the appropriate index is fundamental in programming when working with arrays or vectors, and in this case, Option 4 correctly modifies the last element.
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