Which verb agrees with its subject?

texas and louisiana the leading oil-producing states.

a.
was

b.
is

c.
has been

d.
are

Texas and Louisiana is the leading oil-producing states. 

The answer is:

B. is

Do you have the rest of the question? there is no statement listed

Syllable added to a root word to change its meaning : affixan independent word--example run,walk,book : free morphemeaffix that gives grammatical meaning such as tense or number : inflectiona word part that must attach to a word in order to be usable : bound morphemedegree of comparison formed by adding -er or more to an adjective : comparativedegree of comparison formed by adding -est or most to an adjective : superlativeaffix added to the beginning of a word : prefixaffix added to the end of a word : suffixroot word of lovable : lovetwo roots used together to form one word : combining form