Given a function $H\left(t\right)$ that models the height (in centimeters) of a plant $t$ days after it was planted, estimate $H^{\prime }\left(90\right)$ from the provided graph. What does this derivative indicate?

• A. $H^{\prime }\left(90\right)=-\frac{1}{5}$At $t=90\text{ days}$, the plant is shrinking at a rate of $\frac15\text{ cm/day}$.
• B. $H^{\prime}\left(90\right)=\frac15$At $t=90\text{ days}$, the plant is growing at a rate of $\frac15\text{ cm/day}$.
• C. $H^{\prime}\left(90\right)=\frac15$At $t=90\text{ days}$, the plant is growing at a rate of $5\text{ cm/day}$.
• D. $H^{\prime}\left(90\right)=-\frac15$At $t=90\text{ days}$, the plant is shrinking at a rate of $5\text{ cm/day}$.