<span>The perfect form is the verb tense used to indicate a completed, or "perfected," action or condition. Verbs can appear in any one of three perfect tenses: presentperfect, past perfect, and future perfect. Verbs in the perfect form use a form of "have" or "had" + the past participle.</span>
Amy Tan's A Mother's Tongue The purpose of Amy Tan's essay, “Mother Tongue,” is to show how challenging it can be if an individual is raised by a parent who speaks “limited English” (36) as Tan's mother does, partially because it can result in people being judged poorly by others.
B. because it conflicts more on the topic than the story
A, collision because you need 2 people to collide to have a collision not only one thing/person.
I believe that it is B, because the term vivisection isn't commonly used amongst society, or what we consider is the "normal" type of topic to talk about. The answer be clarifies what exactly the type of testing is, which is medical.