So what is your doubt in this?
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.
The is a definite article meaning that you cannot use it
"an" can only be used before words beginning with vowels
therefore the answer is" a"
C ) IS THE CORRECT ANSWER.
