What does Mr. Jessup mean when he says, “There are protected ocean areas for sailing, fishing, and water skiing” (lines 25C26)?

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What does Mr. Jessup mean when he says, “There are protected ocean areas for sailing, fishing, and water skiing” (lines 25C26)?
A . where lessons are available
B . that attracts professional athletes
C . only for children
D . set aside for these activities
E . with plenty of beachfront

Answer: D