B is correct because all of the verbs are in the same tense.
the answer is contaminated with harmful or poisonous substances.
Answer:
A. It presents the subject of the paper
Explanation:
A thesis statement focuses your ideas into one or two sentences. It should present the topic of your paper and also make a comment about your position in relation to the topic. Your thesis statement should tell your reader what the paper is about and also help guide your writing and keep your argument focused.
