What is the subject of the sentence?

The elementary school cafeteria offers twelve kinds of sandwiches, yet peanut butter and jelly (remains, remain) the most popular of all.]]> Is the subject of the sentence singular or plural?

The elementary school cafeteria offers twelve kinds of sandwiches, yet peanut butter and jelly (remains, remain) the most popular of all.]]> The elementary school cafeteria offers twelve kinds of sandwiches, yet peanut butter and jelly remains the most popular of all. Type the correct form of the words in parentheses into the box, then submit it and say the sentence.

The elementary school cafeteria offers twelve kinds of sandwiches, yet peanut butter and jelly (remains, remain) the most popular of all.]]>