Means not personal; without reference or connection to a particular person; lacking human emotion or warmth.
a. conversation
b. impersonal
c. personal
d. interpersonal

The answer is B. Impersonal and this is because interpersonal is something that is private and impersonal is when people have stuff that is not personal.

"harry t. moore (1905-1951) – civil rights activist, leader, and the first martyr of the civil rights movement. fannie lou hamer (1917–1977) – leader in the american civil rights movement; co-founder of the national women's political caucus and freedom democratic party. james farmer (1920–1999) – congress of racial equality."

the vibration from the sound waves messed with the glass and it shattered.

hope this .