Two expressions to get an answer (If X = Y and A = B then the answer is D)

Struggling on what should be a simple expression Google Sheets: Two expressions to get an answer (If X = Y and A = B then the answer is D)

You can see copy of the doc here. https://docs.google.com/spreadsheets/d/1ufFZfXQb0st4bWP_fcw50FKZSx-tRL58ELTClLsIMQs/edit?usp=sharing