A population of spotted hyenas in a South African National Park currently has 87 individuals. The carrying capacity for spotted hyenas in the park is estimated to be 125 hyenas & the intrinsic growth rate ($r$) is 0.25 hyenas/year/hyena. What is the instantaneous rate of population growth of the spotted hyena population?

• A. 22 hyenas/year.
• B. 7 hyenas/year.
• C. 15 hyenas/year.
• D. 13 hyenas/year.