Which sentence demonstrates proper subject/verb agreement? (remember, "either" is singular.)

a. either of the options were good.
b. either of the options are good.
c. either of the options is good.

The sentence that best demonstrates proper subjective/verb agreement is option B. Either of the options are good. Why did we use "are" instead of "is" for either? It is a general rule that in using either/or and neither/nor, the verb should agree to the noun it preceeds. Since the noun is in the plural form "options", we used "are" instead. Hope this answer helps.