Zachary is married to a U_SJ Citizen. His wife has been a US. citizen fer 2 years.

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Question:

Zachary is married to a U_SJ Citizen. His wife has been a US. citizen fer 2 years. They have been married for 4 years. He has been a lawful permanent resident for 2 and 1/2 years. Zachary wants to apply for his. citizenship given these facts. Can he do so?
Why or why not?