Indicate Whether the Function Is One-To-One $t$ , in Minutes, After the Beginning of the Leak, the the Gulf

Multiple Choice

Indicate whether the function is one-to-one.
-An oil well off the Gulf Coast is leaking, with the leak spreading oil over the surface of the gulf as a circle. At any time $t$ , in minutes, after the beginning of the leak, the radius of the oil slick on the surface is $r ( t ) = 4 t$ ft. Find the area A of the oil slick as a function of time.

A) $A ( r ( t ) ) = 16 \pi t ^ { 2 }$
B) $\mathrm { A } ( \mathrm { r } ( \mathrm { t } ) ) = 16 \mathrm { t } ^ { 2 }$
C) $\mathrm { A } ( \mathrm { r } ( \mathrm { t } ) ) = 4 \pi \mathrm { t } ^ { 2 }$
D) $A ( r ( t ) ) = 16 \pi t$