B) herman von helmholtz
The trichromatic color theory<span> began in the 18th century, when </span>Thomas Young<span> proposed that color vision was a result of three different </span>photoreceptor cells<span>. </span>Hermann von Helmholtz<span> later expanded on Young's ideas using color-matching experiments which showed that people with normal vision needed three wavelengths to create the normal range of colors. Physiological evidence for trichromatic theory was later given by </span>Gunnar Svaetichin<span> (1956).</span>
VERY good
I like the intro you wrote maybe add another sentence that is stronger for the last sentence
By showing objects on the table from various vantage points at the same time.
M, M, m, A, D, M, A, M, m for the first line i haven’t done this for years since i finished theory a long time ago so i might be wrong for two of them
