Context: Read the passage. Then answer the question.

Brown-headed cowbirds lay their eggs in the nests of yellow warblers or other songbirds. When a cowbird egg hatches, the warbler parents feed and raise the cowbird chick as their own. This way, the cowbird parents don't spend their own energy raising their offspring. The warbler parents spend so much time and energy raising the cowbird chick that they are not able to raise as many of their own offspring.
Figure: a yellow warbler feeding a brown-headed cowbird chick.
Which type of relationship is formed when a brown-headed cowbird lays an egg in a yellow warbler nest?
A. parasitic
B. commensal
C. mutualistic
Pick the correct answer from the listed options and provide the letter of the selected option.

A