Answer:biased means:unfairly prejudiced for or against someone or something.
and unbiased means free from bias.
Explanation:
hope this helps :)
It is usually stated in overt terms and often changes throughout the poem. The correct answer should be "It is not always stated overtly and is understood only by reading the whole poem". This is correct because the theme usually does not change itself, but there can be multiple themes analyzed.
What exactly are we meant to do?