Answer:
(a) The force that applied was balanced by another force
Step-by-step explanation:
The block has its own mass which serves as the opposing force to the pulling force.
The pulling force must be greater than the weight of the block for the block to move.
If the pulling force is less than or equal to the weight, there wont be motion.
hence, The pulling force that she applied was balanced by another force(weight of block).