How does predation alter a population’s gene pool?

a. predators catch the weakest and/or slowest of the prey; this encourages more adept prey and in turn better predators
b. predators catch random members of the population of prey, encouraging genetic drift in prey
c. predators always catch sufficient prey, encouraging genetic divergence among themselves

Option C

Explanation:

If we consider Darwin's theory we would realize that the species which are not able to survive are unfit or weak. Thus, predators usually attack species that can be easily targeted. Hence, it this way predation leads to selective pressure on any species and hence leads to creation of a fit gene pool. The weak organisms are removed and more fit organism could mate among themselves to produce healthy offspring.  

 Hence, option C is correct

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added