so i need help.. this has to do something with Kevlar. when was the first bulletproof vest invented? A) 1975 B) 1964 C) 1990 D) 2006

In the 1960s, new fibers were discovered that made truly bullet resistant vests possible. In the early 1970s, DuPont's Kevlar ballistic fabric was invented. In 1975-1976, scientists came to the conclusion that Kevlar was bullet-resistant, wearable and light enough for police officers to wear full-time. Hope this helps!

1.a)britain

2.b)spain

3.c)french

4.d)portugal

explanation:

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