This question tests the ability to spot a common thread in a group of words and find another word that carries the same sense. The words given are "expedite," "hasten," and "hurry," and all three mean to make something happen faster or to move quickly.
The correct option is "accelerate" because it shares the same core meaning as expedite, hasten, and hurry: to make something happen sooner or move at a faster pace.
Let's summarize:
So the word that completes the group correctly is "accelerate," option (A).