What is not mentioned when Maggie is talking about her experience in Ocean Park

A．How to Play Chess
B．Play Chess With Lens
C．Relationship Between Chess-playing and Lens-designing
D．What Insight From Lens to Chess

A．In the number of steps each takes towards the goal.
B．In the designs of the two activities.
C．The steps to the goals and the goal itself are known.
D．Each has a doer and a competitor.