Final answer:
When dealing with compound subjects joined by 'or' or 'nor,' the verb should agree with the word closest to it, following the Proximity Rule.
Explanation:
In sentences where compound subjects are joined by 'or' or 'nor,' the verb agrees with the word closest to it, following the Proximity Rule. In this case, the correct sentence with a compound subject joined by 'or' and with the correct subject/verb agreement is:
B. Either Kelly or her brothers is going to the mall.
This sentence follows the rule that the verb should agree with the word closest to it, making 'is' the correct verb choice in this context.
Learn more about Subject-Verb Agreement with Compound Subjects here:
https://brainly.com/question/27310879
