The correct answer is: B. is
Sugarcane is a tall grass that is usually two to three meters long. It is a perennial plant, which means that it lives for more than two years. Sugarcane is grown in tropical and subtropical regions around the world. It is used to make sugar, ethanol, and other products.
The other options are incorrect because they do not agree with the subject of the sentence, which is “sugarcane.” The subject is singular, so the verb must also be singular. Option A, “are,” is plural. Option C, “was,” is the past tense of the verb “to be,” which is not appropriate for this sentence. Option D, “were,” is the past plural form of the verb “to be,” which is also not appropriate for this sentence.
In conclusion, the correct answer to the question “Sugarcane . . . . . . . . usually two three meter long?” is: B. is