Because Katherine Johnson was proficient at math, she was hired as a "human computer" for NASA and earned a reputation for the accuracy of her calculations.
Answer: Option A.
Explanation:
Cause and effect relation ship is the relation ship between the reasons which lead to a particular thing. The cause stands for the reason and the effect stands for the outcome in the cause and effect relation ship so the reasons leading to an outcome is the meaning of this.
In the article it has been shown that since Katherine Johnson was so good at Mathematics and calculations, as a result of this she was hired by NASA and given the title of human computer.