A five$-$gallon bucket holds $18,937c{m}^3.$ If $50lb(22,680$grams$)$ of gravel with an apparent specific gravity of $2\mathrm{.}378$ is poured into the bucket, roughly how many $c{m}^3$ of bulk volume is occupied by the aggregate?

a$.5,500$

b$.7,500$

c$.9,500$

d$.7,250$