What penalty is assessed when a Red Blocker initiates contact to a White Blocker in the center of their back, allowing the Red Jammer to pass?

The correct choice identifies a Back Block penalty because this situation involves contact initiated by the Red Blocker to the center of the White Blocker's back. In roller derby, blocking an opponent in the back is explicitly against the rules, as it can be dangerous and gives an unfair advantage to the jammer. This penalty is assessed when the action compromises the safety of the players and affects gameplay, especially if it facilitates the passing of the jammer, which the rules aim to prevent.

In contrast, other penalties listed would not apply in this scenario. A forearm penalty typically involves the use of the forearm to push or shove an opponent illegally, while Cutting the Track involves a skater improperly re-entering the track after going out of bounds. Lastly, a No Penalty would indicate that the action was compliant with the rules, which is not the case in this instance.