Need Help please.

I'm not 100% sure and I don't have much time until I need to turn it in.

But my bess guess is C I think

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation:

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it