Answer: Martin Luther King Jr. was an American minister and activist for civil rights in the 1950s and 1960s.
Explanation:
A simple sentence is made up of an independent clause along with one single subject and a verb with a compliment.
In the first option, there is a single independent clause which is that MLK was an American ministers and activist. The subject is MLK and the verb and compliment are the years he was active.
