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Question: I dentify the correct sentence:

a.

Studying the development of quokkas and crows is one way to go beyond just-so stories in trying understand how we got human.
b.

Studying the development of quokkas and crows are one way to go beyond just-so stories in trying understand how we got to be human.
c.

Studying the development of quokkas and crows is one way to go beyond just-so stories in trying understand how we got to be human.
d.

Studying the development of quokkas and crows are one way to go beyond just-so stories in trying understand how we got human.