Step 1: Understanding the Subject-Verb Agreement:
"A variety" is a singular subject, even though "variety" refers to many different kinds. This is why we use the singular form of the verb "is." Step 2: Analyzing the Options:
- Is: This is the correct choice, as "variety" is singular and requires a singular verb.
- Are: This is incorrect because "are" is used for plural subjects.
- Has: This is incorrect because "has" is used with singular nouns, but the subject is a singular "variety," not a singular possessive subject.
- Have: This is incorrect because "have" is used with plural subjects. Step 3: Conclusion:
The correct verb is is.