The correct answer is act with speed.
A. act with speed
The correct answer is (A) To act with speed; to send off, or away, with speed (as a letter, messenger, body of troops, etc.); get (piece of work, etc.) done or finished promptly, settle or end quickly. Also, to dismiss (a person), as after an audience. Finally, to kill, put to death quickly.
Dispatch comes from Spanish despachar (to expedite).
Examples of use:
- He dispatched a limousine to pick up his important customer.
- They dispatched the two terrorists promptly..