It look like both A & B are both correct usage of commas
Answer:
By the year 1960, the Civil Rights Movement had obtained a great audience. Thanks to Martin Luther King Jr and his admirable efforts to advocate non violence, African American activists around the globe were able to gain a widespread support.
Answer: I would say the answer is gravity
Explanation:
What are the options? I don't see any.
The answer is the first one A.