A biologist began studying a population of bullfrogs. In 1998, she found that most of the male frogs croaked, but some did not. A bat species known to
prey on male frogs migrated to the area in 2005. The biologist returned to the
area in 2008 and repeated population counts of male frogs. The table shows
her data.

Which statement best summarizes the data?
O A. The croaking males decided to stop croaking to avoid the bats.
OB. A new mutation made the croaking males stop croaking.
O C. Noncroaking males were selected for in the site with predatory
bats
OD. The croaking males adapted to the presence of the predatory bats.