Explanation:
are you doing English 2? if so I am as well you should hmu so we can help each other
Answer:
As the answer above suggests, it was the main character's own guilty conscience. As we know, he is... a little mentally unstable. The heartbeat is not from the old man's corpse, it is from his own delusions and insanity from the guilt that he made for himself by murdering the old man in cold blood. Eventually, his guilt from killing the man and his fear of being caught boil over, and he confesses his crime in a dramatic breakdown.
We can't really help you because you didn't give us any of your options to choose from.
However, I can try and explain to you what internal rhyme is, so hopefully you will be able to do this on your own.
An internal rhyme is also known as middle rhyme, and it refers to a type of rhyme which occurs within the same line. You know that the regular rhyme refers to multiple lines rhyming, but when it comes to internal rhyme, words within one single line rhyme.
Here is an example:
My unusual <u>style</u><span><u> </u>will </span><span>confuse you a <u>while.</u></span>
The is...........................A