The ________ function returns a string that has been converted to uppercase text.

The correct answer is: D. Upper

The Upper function returns a string that has been converted to uppercase text.

The AllCap function returns a string that has all letters in uppercase, except for the first letter of each word.

The UCase function returns a string that has all letters in uppercase, except for the first letter of each sentence.

The UpCase function is not a valid function in Python.