Why Did the Closeness of His 1960 Victory Cause Kennedy

Why did the closeness of his 1960 victory cause Kennedy to move slowly on civil rights?

A) He was concerned about alienating southern Democrats who chaired important congressional committees and who would make the passage of civil rights legislation virtually impossible.
B) He realized that he garnered the support of only about half of the black voting population and knew he must patiently win the confidence of the rest.
C) He planned to address civil rights issues in his second term when, he believed, the country would be more ready to accept new legislation.
D) He understood that congressmen who had signed the Southern Manifesto would oppose him in foreign policy issues if he pushed too hard on civil rights.