Say whether the following sentences are correct or incorrect. Choose the correct alternative.
(I) My brother and his friend commutes every day.
(II) Measles have become less common in the United States.

The correct answer is Option D (Both (I) and (II) are incorrect).

Key Points:
• Both sentences contain Subject-Verb Agreement errors.
• In sentence I, the subject is plural ('My brother and his friend'). The verb should be plural 'commute', not the singular 'commutes'.
• In sentence II, 'Measles' is the name of a specific disease. Although it ends in 's', it is a singular noun and requires a singular verb ('has'). The use of 'have' is incorrect.
• Since both contain errors, Option 4 is correct.
• Key Takeaway: Subjects joined by 'and' take plural verbs. Diseases ending in 's' (Measles, Mumps) are singular and take singular verbs.