This question tests the knowledge of basic mathematical operations. The opposite of 'multiply', which means to increase by adding groups of the same number together, is 'C. Divide', which means to separate into parts or shares. 'Add' is the operation of combining numbers, 'Subtract' is the operation of taking one number away from another, and 'Exponentiate' is raising a number to the power of another number, none of which are the opposite of multiply.