What is the result of double fertilization in an angiosperm?

a. double fertilization produces a triploid zygote and diploid endosperm.
b. double fertilization produces a diploid zygote and triploid endosperm.
c. double fertilization produces a triploid zygote and a triploid endosperm.

As in angiosperm one sperm fuses and fertilize the egg to form diploid zygote and other fuses to form the triploid cell when it fuses with two polar nuclie 
this process is called double fertilization
so the correct option for above is
Double fertilization produces a diploid zygote and triploid endosperm
so option B is correct
hope it helps

In my own word cell technology can  lead to advances in the understanding of diseases mechanism and transmission because diseases is very bad