Having a complete set of electrons in a valence shell will increase or decrease the rate of a chemical reaction

decrease

Explanation:

atoms seek to have full valence electrons, and react with others in order to gain or lose electrons. When an atom has all valence electrons it is not reactive. This is why noble gases aren't reactive.

option number one would be youre best option

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."