You would use the word is because it makes sense
To relate to the speaker's nature of emotions
<span>B... Because you don't want to put all the background information in the first paragraph. That would ruin the rest of the story .</span>
Answer:
The sole reason for all his acquiescence is that Iago is dangling the fact that he will help the besotted dolt win Desdemona's affection like a carrot in front of him. Roderigo is obsessed with the beautiful Desdemona, Othello's wife, and would do everything to have her.
