Chargaff's rule states that the amounts of guanine and cytosine are roughly the same, and the amounts of adenine and thymine are roughly the same
a. and the relative amounts of g+c and a+t don't vary by species
b. but the relative amounts of g+c and a+t vary by species
c. in eukaryotes only. the rule doesn't apply to prokaryotes.
d. except in species that use uracil in place of thymine in their dna

B. but the relative amounts of G+C and A+T vary by species.

Explanation: Chargaff's rule states a relantionship between guanine (G) and cytosinev(C) amounts and adenine (A) and thymine amounts (T). But these amounts could  change  across species, so much so, GC content is a characteristic of each species genome. For example, there some bacteria like Actinobacteria classified as " high GC bacteria", a plant Arabidopsis thaliana has 36% of GC content and others like Plasmodium sp. are classified as "high AT content".

the most logical answer would be a

if the hares very faster than they are now, and thus the lynx's hunting success rate drops because it will be harder to catch them, the rate that will change will be the pray-rate. the pray-rate will change because more hares will be able to survive, thus more individuals for reproduction, so the end result will be increasing population of hares.

the predator-rate will remain pretty much the same because there will be more than enough pray, but the hunting success rate is stagnant.