Instead of comparing all four options side by side, try substituting each option into a sentence describing someone who "said very little but conveyed the point" and see if the meaning still holds. That test isolates the exact shade of meaning being asked for.
"He gave a laconic reply" and "her answer was succinct" both describe a response that used minimal words but got the point across. Now test the substitutions:
Because abrupt shifts the focus from word count to tone and suddenness, it breaks away from the shared meaning of laconic and succinct, while terse, brief and concise all preserve that meaning.
The correct answer is option 4, Abrupt.