Final answer:
Sequencing an individual's genome is already possible, so the concern about time is not valid. Yet, ethical issues such as genetic discrimination and designer babies are valid criticisms of genome mapping.Hence, option A is not a valid concern.
Step-by-step explanation:
The concern that mapping the human genome will take many more years to complete is NOT a valid concern since sequencing an individual's genome is currently possible. However, other concerns mentioned, such as it leading to discrimination against people with certain genetic profiles and the creation of "designer babies", are valid criticisms. There are significant ethical considerations associated with genome sequencing, including genetic discrimination, possible legal issues related to privacy, and the potential for human genetic engineering. These ethical questions become even more pressing given the real possibility of making informed medical decisions based on personal genomic information.