he probability of randomly selecting a yellow marble from a bag of marbles is 1. What conclusion can we make.

Responses
A There are only yellow marbles in the bag.There are only yellow marbles in the bag.
B There are no yellow marbles in the bag.There are no yellow marbles in the bag.
C Half of the marbles in the bag are yellow.Half of the marbles in the bag are yellow.
D Most of the marbles in the bag are not yellow.

A. There are only yellow marbles in the bag.