Provitamin A, also known as beta-carotene, is necessary for human health. People who do not make this substance suffer serious medical problems. Which application of genetic technology has been the MOST promising for treating people who suffer from a deficiency of provitamin A?

A. Developing transgenic bacteria that can break apart provitamin A.
B. Developing gene therapy to eliminate the body's need for provitamin A.
C. Developing GM foods that produce and store provitamin A.
D. Altering the processes of transcription and translation used for provitamin A synthesis.