what research?
ничего о ресерче нету же
always read the context first — what does Victor describe? What did he begin?
but the underlined portion is about practical approach, not scientific one
never leave reference words — pronouns included — unattended. Who is "He" that might dissect and anatomize; whom is "him" that causes were unknown to?
there is no relation between the option C and the second sentence!
make sure you know the difference between "немного" and "little" (yes, there is a difference)