The Human Genome Project, which got underway in 1990, is an international effort to ________.

A) clone deleterious genes from humans and study their mode of action
B) clone beneficial genes from humans for eventual use in gene therapy
C) collect samples of cells from all parts of the world in order to preserve human genetic diversity
D) construct a physical map of the billions of base pairs in the human genome
E) determine how many different human populations share in a common gene pool