The bioengineered food products are those food products, which are modified by the alteration in their genetic material. There alteration in the genetic material is done by changing and incorporating the gene of interest in the DNA of the organism. Sometimes, the gene of interest are derived from the genome of the other organisms.
The use of the chemical pesticides escalated the green revolution, at that time the genetically modified food product were not so developed.
Hence, the correct answer is c. They were developed during the Green Revolution.