The correct answer is A. running.
An oar is a long, thin piece of wood or metal that is used to propel a boat through the water. It is held in place by a rowlock, which is a metal or wooden fitting that is attached to the side of the boat. The rower uses the oar to push against the water, which moves the boat forward.
A foot is a part of the human body that is used for walking, running, and jumping. It is made up of the toes, the foot bones, the ankle, and the heel. The foot is attached to the leg by the Achilles tendon.
The oar is to the rowboat as the foot is to running in that they are both essential for the movement of the respective object. The oar is used to propel the boat through the water, while the foot is used to propel the body forward when running. Without either of these, the object would not be able to move.
The other options are not as closely related to the oar and the rowboat as running is. A sneaker is a type of shoe, a skateboard is a type of board, and jumping is an action. None of these are essential for the movement of a rowboat.