The Oparin-Haldane theory regarding origin of life suggests that

A. Most of the living organisms once originated due to a number of chemical reactions in the earth

B. Complex organic molecules would have been formed through a series of chemical reactions in the earth's 'primordial soup'

C. Abundant energy must have been available in the form of heat, cosmic rays and lightning to drive the chemical reactions

D. Both B and C

Answer: Option D