टीचर ऑफ सन ऑफ यू स्टोन एज हाउसेस फ्रॉम द फॉलोइंग ऑप्शन​

The given sentence is in Simple Present tense. 'Requires' is a simple present tense verb that states a general truth.

When changing the tense of the sentence, the verb form will be changed. The Simple Future verb form is: will require.

Hence the answer is:

This will require an exercise of will.