Research describing a link between childhood vaccines and autism has been

a. confirmed by multiple studies
b. retracted due to a financial conflict of interest by the author
c. found to have been based on falsified data
d. published once but not confirmed

B. retracted due to a financial conflict of interest by the author

Explanation:

The name of the author related to that research is Andrew Wakerfield.

He is a British Surgeon who is working together with another company to develop a certain type of drug which he promise will prevent autism among children.

Manipulating research to make it look like there is a link between childhood vaccines and autism was made as an elaborate shceme to make parents choose to buy his drug instead.

can you explain it better

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.