DIRECTIONS : Choose the word from the options which is most Similar in meaning…

Explanation:

The verb "invalidate" means to make something invalid, to cancel, annul, or nullify it.

• Nullify — Correct: means to make void or deprive of legal force; this is a direct synonym of "invalidate."

• Invariable — Incorrect: means unchanging or constant, which is not related to canceling or annulling.

• Naught — Incorrect: means nothing or zero; it denotes absence but is not a verb meaning to cancel.

• Intractable — Incorrect: means difficult to manage or stubborn, unrelated in meaning to "invalidate."

Conclusion: "Nullify" is the best synonym for "invalidate."