Hey student!
Great question!~
I will need to update my explanation for this question because I made a mistake when explaining the answer. I'm so sory~ it was a great catch by you. Let me explain.
I misread the from 4,100 to 4,900 grams and thought of it backwards. If the body mass increases --> the frquency decreases.
So eliminate (A) and (B) because of "increase."
Next, all you have to do is subtract: 1.9 - 1.75 = .15 or answer (C).
It's a simple question that I obviously overlooked...sorry for the confusion, but you don't have to overthink this question. It's pretty straightforward.
Trust yourself! and Keep moving forward!
You got this!