The indefinite pronoun neither is always singular.
Neither is the negative counterpart of 'either' which is also singular. The basic principle of Subject-Verb Agreement says that the subject and verb must agree with each other, so you should use a singular verb because 'either' and 'neither' are considered singular; however, this principle is sometimes broken by a plural verb which can be used after 'either' and 'neither' informally.
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B. is the only based on true facts I know
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The brain is the most vital organ in the human body because they're more developed than the brains of other animals. However, humans have traits that other animals don't, such as, the ability to think, ability to invent new ideas, and ability to remember.
I had to look for the missing detail for this question which I attached here.
And I would say that among the given images, the one that presents the identification of causal relationships would be the second one. Hope this answers your question.