Which of the following sentences contains an example of correct subject-verb agreement?

The sentence "My sister or my brother is picking me up from school today" demonstrates correct subject-verb agreement because it follows the rule that when two singular subjects are joined by "or," the verb should also be singular. Here, "sister" and "brother" are both singular nouns, and the verb "is" correctly agrees with them.

In contrast, other sentences present challenges with subject-verb agreement. For example, "Neither my mom nor I are attending the concert" incorrectly uses the plural verb "are" with "I," which should take the singular verb "am" instead. Similarly, "Mary and Tom is arriving around 5 o'clock this evening" incorrectly uses the singular verb "is" with the compound subject "Mary and Tom," which requires the plural verb "are." Lastly, "Each of the girls play the piano well" incorrectly uses the plural verb "play" with "Each," which is singular and should take the singular verb "plays."

Thus, the first sentence is the only one that maintains the appropriate subject-verb agreement.