How does a single fixed pulley, like the one seen here, help you do work?

Responses
A changes the direction of the forcechanges the direction of the force
B increases the amount of applied forceincreases the amount of applied force
C decreases the amount of applied forcedecreases the amount of applied force
D allows you to pull the rope a shorter distanceallows you to pull the rope a shorter distance

A changes the direction of the force