I say the answer is a). Due to is correctly used following verbs of being. My laughter is due to the jokes he's been telling.
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BellyWhy are you laughing so hard?If the person who wrote the test item says that (d) is the correct answer, he or she is clearly not a native speaker. I ag
______ the jokes he's been telling
a) because of
b) in light of
c) as a result
d) Due to
I think both a and d will do but the answer is d