Multiple choice D. D. T. was first manufactured in the year 1935 1940 1945 1950 Reveal answer Fill a bubble to check yourself B Correct answer Explanation DDT (dichlorodiphenyltrichloroethane) was first synthesized in 1874, but its insecticidal properties were discovered by Paul Muller in 1939. It began to be manufactured and used on a large scale around 1940.