Answer:
The most appropriate answer would be a)to identify the 3 billion genes that comprise the human genome.
Human genome project was the collaborative international project with the common objective of sequencing the whole genome of a human being and to identify and map all the genes present in the genome.
The project was completed, by sequencing approximately 3 billions base pairs of the human genome.
Later, it was found that only around 20000 protein-coding genes were present in the human genome which was very as compared to the previous estimations (1 million to 50000).