The Space (In $\mathrm{m}^{3}$ ) in a Landfill Decreases with Time as Given by Time

Multiple Choice

The space (in $\mathrm{m}^{3}$ ) in a landfill decreases with time as given by the function $F(t) =260-60 \log _{5}(4 t+1)$ , where $t$ is measured in years. How much space is left when $t=1$ ?

A) $320 \mathrm{~m}^{3}$
B) $180 \mathrm{~m}^{3}$
C) $110 \mathrm{~m}^{3}$
D) $200 \mathrm{~m}^{3}$