Fidan Is Studying a Model of Obesity

Fidan is studying a model of obesity. For her experiment, Fidan uses three groups of 31 rats each that are given either (1) 24-hour access to high calorie treat food in addition to their normal chow, (2) restricted 8-hour access to high calorie treat food and 24-hour access to their normal chow, or (3) 24-hour access to only their normal chow. Every day, Fidan weighs the animals and carefully takes note of the amount and type of food each animal has consumed. At the end of the experiment, Fidan performs surgery on all the animals and notices that the animals that put on the most weight showed noticeable differences in their hypothalamus compared to the rest of the rats.
-Every day,Fidan weighs each rat.What does it mean when she says one of the rats scores at the 70th percentile of weight

A) The rat has 70% more weight than the average.
B) The rat weighs more than 70% of the other rats.
C) The rat weighs less than 70% of the other rats.
D) The rat weighs more than 30% of the other rats.