Answer:

Explanation:

The correct answer is "isn't cooking". Let's break down the answer to understand why this is correct:

Subject-Verb Agreement:
- The subject of this sentence is "my wife".
- The verb in the sentence is "cook" (in the present tense).
- In English, the subject and verb in a sentence must agree in number and person.

Negative Form:
- The sentence is in the negative form, which means we need to use the contraction "isn't" instead of "is not".
- The contraction "isn't" is short for "is not".

Present Continuous Tense:
- The sentence is in the present continuous tense, which means we need to use the present tense of the verb "to be" (in this case, "is") and the present participle of the main verb (in this case, "cooking").
- The present participle of "cook" is "cooking".

Putting It All Together:
- The sentence is in the present continuous tense and is negative, so we need to use the contraction "isn't" and the present participle "cooking".
- Therefore, the correct answer is "isn't cooking".

Conclusion:
- In summary, the correct answer is "isn't cooking" because it uses the present continuous tense, subject-verb agreement, and correct negative form.