Answer:
It shows how the author feels towards the subject of the poem.
Explanation:
The attitude the author has toward the subject dictates the mood of the poem.
The the ditch could stop others from invading the town
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>