Nhận biết (M1)

In the retina of the human eye, long (L), medium (M), and short (S) cone cells help process bright light and color by sending signals to the brain. M cones react to a range in the visible spectrum of light that completely overlaps with those L and S cones react to. As a result, __________

Which choice most logically completes the text?

• A.

  it is possible to study the roles of L, M, and S cones because each type of cone can be activated without activating the other types.

• B.

  L cones react only to wavelengths associated with the color red, S cones react only to wavelengths associated with the color blue, and M cones react only to wavelengths associated with the color green.

• C.

  it is difficult to exclusively study the role of M cones in human vision under natural conditions because M cones can’t be activated without simultaneously activating the L and S cones.

• D.

  the brain more easily interprets colors in the range that both L and S cones react to than in the range that M cones react to.