The correct option is B S.L. Miller
Oparin and Haldane proposed that life on earth could have originated from the non-living organic molecules, for example RNA, and protein.
Based on the hypothesis given by Oparin and Haldane, Stanley Miller conducted an experiment which provided evidence of chemical evolution.
He created primitive earth conditions in a laboratory. He took a closed flask containing gases like CH₄, H2, NH3 and water vapour at 800°C and created an electric discharge. He observed the formation of amino acids after a few weeks. In similar experiments, other scientists have reported the formation of sugar, and nitrogenous bases.
Louis Pasteur provided evidence to support the concept which states that new life originated on earth from pre-existing life forms. For example, a cell arises from a pre-existing cell, and flies develop from larvae.
So, the correct answer is S.L. Miller.