The answer is B, "the government is complicated." In the other examples, the subjects and verbs dont match grammatically. For example, in A, the word "forest" should be plural to use the very "are".
I do not know the answer, but after looking it up it seems that someone else has asked this question, and someone else has answered. I'm putting the link to that question right here! --> (brainly.com/question/8921506)
