Correct the following text by inserting one comma.
Since Laurie Marker, founder of the Cheetah Conservation Fund, moved to Namibia in 1977 she has studied cheetahs and sought to protect them.
A. Place a comma after the word “Since.”
B. Place a comma after the word “1977.”
C. Place a comma after the word “Namibia.”
D. Place a comma after the word “cheetahs.”

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