If you are neither relaxing or contracting a specific muscle, the amount of ATP is A. staying the same or increasing.
Muscle cells require ATP as a source of energy for contraction and muscle movement. Even when you are setting your muscle to a relaxing mode, you are using some ATP to do so.
However, if a muscle is set in such a state that it is neither relaxing not contracting, hence there is no work being performed by the muscle. At this stage the ATP amount inside this muscle will remain the same and can increase if the neurons bring some extra ATP for the muscle cells to store here.
Although a part of your question is missing, you might be referring to this question:
If you are neither relaxing or contracting a specific muscle, what is happening to the amount of ATP that is available in that muscle cell?
A. It is staying the same or increasing.
B. It is decreasing rapidly.
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