Which of These Observations Regarding the Likelihood of Life Existing

Multiple Choice

Which of these observations regarding the likelihood of life existing elsewhere in the universe has NOT yet been made?

A) discovery of assemblies of organic molecules into cell-like, self-replicating structures in the soils of Mars and the atmosphere of Venus
B) discovery of long-chain carbon-based molecules in interstellar clouds by radio astronomers
C) manufacture of organic compounds in laboratory simulations of primordial planetary atmospheres
D) discovery of long-chain amino acid protein molecules in meteorites