Oparin and Haldane proposed theory of origin of life. According to their theory, life evolved in the oceans during a period when the atmosphere was reducing containing H2, H2O, NH3, CH4, and CO2, but no free O2. Organic compounds were synthesized nonbiologically by ultraviolet light energy, which in the absence of an ozone shield would penetrate the upper layers of the ocean. Without free O2 to oxidize them, these organic molecules would be stable, and would accumulate in a warm, dilute broth that has been nicknamed "Haldane soup". The first living organism would be little more than a few chemical reactions wrapped up in a film or membrane to keep them from being diluted and destroyed. These organelles would absorb chemicals, grow, divide, and obtain energy by fermenting the available organic molecules around them. Thus, option A is correct and other options are wrong.