The danger of crops becoming extinct before scientists can study them is A.
future scientists will not have jobs.
B.
only scientists fully understand how useful plants can be.
C.
opportunities for improved crops or new medicines will be lost.
D.
scientists have not yet developed effective classification standards for plants.

c

Explanation:

it makes the most sense

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.