If a person looking at a poster sees green instead of yellow and doesn't see red at all, this person most likely has color blindness where nerves fail to respond to light properly.

a. yellow-sensitive
b. blue-sensitive
c. red-sensitive
d. green-sensitive

The correct answer for the fill in the blank is C. red-sensitive.

Colorblindness occurs when one or more type of cone cells ( light sensitive cells in the retina for color vision) are either not present or have very low spectral sensitivity.

In this case, the L type of cone cells would be damaged or absent as they are responsible for detecting long wavelength of light ( responsible for yellow and red colors)

Thus, when a person who is looking at a poster, sees green color instead of yellow and doesn't see red at all, this person most likely has color blindness where red sensitive nerves fail to respond to light properly.  

b.transmitters send radio waves, and receivers capture radio waves.