Final answer:
When you pull up on a block with a tension greater than its weight, d. the block moves upward due to the unbalanced force.
Step-by-step explanation:
If you pull up on a block with a tension T which is greater than the weight of the block, the block will move upward. This is because the unbalanced force (net force) acting on the block is in the upward direction. According to Newton's Second Law of Motion, if the tension is greater than the weight, which is the force due to gravity (mg), then the net force is upwards and the acceleration of the block will be upwards, resulting in the block moving upwards.