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C is the answer to ur question
The writer of the Book of Deuteronomy set the story into the framework of three sermons by Moses to the Israelites as they stand on the plains of Moab poised to cross the Jordan River and enter the Promised Land.
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>