Answer Happy

A licensee has an exclusive buyer agency agreement in place. The
buyer signs a contract to purchase through a different licensee at
an open house because of the buyers agency agreement, which of the
following is true?
A. The seller/listing broker owe the buyer's agent a
commission
B. the seller/listing broker owe the listing agent and the
buyer's agent a shared commission
C. the original buyer's agent is owed a commission according to
the agreement
D. the original buyer's agent is entitled to no commission
I only saw one person answer this question and I would
like an answer but also an explanation. Thanks!