A Researcher Is Looking for Met^-strains

A researcher is looking for met^-strains. He compares two plates. One plate has colonies growing on complete medium. The other plate has colonies growing on methionine-deficient medium. How can the researcher determine which colonies are met^-?

A) The colonies growing on the methionine-deficient plate are met^-.
B) Colonies growing on the complete medium, but not on the methionine-deficient medium are met^-.
C) More experiments must be performed to identify the met^-colonies.
D) All of the colonies growing on the complete medium are met^-.
E) Colonies growing on the methionine-deficient medium, but not on complete medium are met^-.

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