Which is a well-written research question?

Responses
A What makes dolphins act so funny?What makes dolphins act so funny?
B Why don't people ever get tired of studying dolphins?Why don't people ever get tired of studying dolphins?
C How do dolphins differ biologically from porpoises?How do dolphins differ biologically from porpoises?
D Why are dolphins so often listed a person's favorite animal?Why are dolphins so often listed a person's favorite animal?

1 answer

C How do dolphins differ biologically from porpoises?
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