The correct option is D The tool maker
Louis Leakey was a tireless promoter of the study of human origins and exerted tremendous impact on the prevailing conception of early humans with his theoretical and paleontological work in the field. The first significant hominid fossil attributed to Leakey was found by Louiss collaborator and second wife, Mary Leakey. It was found in deposits that also contained stone tools and Louis claimed it was a human ancestor and called it as Zinjanthropus boisei. Another important discovery was the 1964 reporting of Homo habilis, which Leakey believed was the first member of the actual human genus as well as the first true toolmaker. However, the interpretations of Leakeys fossil finds are still controversial. Their significance to the field of human origins is universally acknowledged.
Therefore, the correct answer is option D.