I'm currently stuck in biology so I'd really appreciate the help - thanks :)

It should be B because Chargaff proposed that the amount of Adenine = amount of Thymine (they also happen to match because one is a purine and the other a pyrimidine) and the amount of Cytosine= Amount of Guanine or A=T and C=G, this is true for the composition of DNA in all species, the ratio of each pair however can change depending on animal.

The eye characteristic that is being assessed by the process in which the client’s eye is being tested in a way where the cardinal fields of vision for coordination and alignment is being determined is the visual acuity. It is because the visual acuity is where a person could identify the vision’s coordination and alignment for they are the one responsible for measuring the ability of the eye to see in a given distance and to determine the vision’s sharpness and coordination.