Genetically modified grass varieties that carry genes for disease and drought resistance are now available. they were produced by recombinant dna technology. however, the government has still not approved the sale of most of them, due to cautionary factors. what is the main reason for this concern?

a) the possibility of the fragile recombinant organisms dying.
b) the possible patent violations from competing biotechnology companies.
c) because the new genetically altered grasses are too expensive for consumers.
d) release of genetically engineered organisms into the environment with unpredictable results.