The Scenario of Prebiotic Evolution Leading to the Origin of Life

The scenario of prebiotic evolution leading to the origin of life on Earth is plausible because

A) there was a vast period of time for simple chemicals to evolve into complex molecules found in cells that exist today.
B) it has been observed to occur near thermal vents at the bottom of the ocean.
C) experiments suggest that all of the chemical components of living cells can be formed quickly from inorganic precursors.
D) it has been observed under laboratory conditions.
E) it has been observed to occur on other planets.