Which finding, if true, would most directly support Alegado and colle… | Verbal SAT Question

Biologist Rosanna Alegado believes that we might learn how multicellular organisms developed from single-celled ones if we understand why the single-celled organism Salpingoeca rosetta, the oldest living relative of animals, sometimes forms colonies of cells. Alegado and colleagues reviewed data from many studies of how S. rosetta responds when exposed to another single-celled organism, bacteria, including Jongsik Chun’s work with Algoriphagus mannitolivorans bacteria and Ingrid Brettar’s work with Aquiflexum balticum bacteria. Alegado and colleagues concluded that A. mannitolivorans is more likely than A. balticum to have played a role in the development of multicellular organisms.

Which finding, if true, would most directly support Alegado and colleagues’ conclusion?

Both Chun’s and Brettar’s experiments resulted in the formation of colonies of S. rosetta.

Neither Chun’s nor Brettar’s experiments resulted in the formation of colonies of S. rosetta.

Chun’s experiment resulted in the formation of colonies of S. rosetta, whereas Brettar’s experiment did not.

Brettar’s experiment resulted in the formation of colonies of S. rosetta, whereas Chun’s experiment did not.