Final answer:
The correct answer is option 2) blue
Step-by-step explanation:
When a surface is illuminated by magenta light and the red component is absorbed, the surface will appear to be the color that is the mixture of the remaining components of magenta light, which are blue and red. However, because red is absorbed, only blue will be reflected, thus, the surface will appear blue.
Magenta light is a combination of red and blue light. If red light is absorbed, only blue light is left to be reflected. In the context of the subtractive color model, which applies to pigments and dyes, the absorption of one of the primary additive colors (red, green, and blue) results in the appearance of the complementary color to the absorbed color.
In this case, when red light is absorbed by a surface under magenta illumination, the result is the appearance of blue light, because blue is the complementary color to red in additive color mixing. Therefore, the correct answer is option 2) blue.