If $B$ is a set of real numbers, is there a number in $B$ that is divisible by seven?

If $B$ is a set of real numbers, is there a number in $B$ that is divisible by seven?

(1) Every number in $B$ is both positive and even.
(2) There are three numbers in set $B$ between 1 and 100 each of whose digits add up to 5.

Answer: C

Source: Princeton Review

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