Answer the Following Question Involving a Conversion Within the USCS $128 \mathrm { fl } \mathrm { oz }$

Answer the following question involving a conversion within the USCS system.
-The container holds 4 gallons of water. How many fluid ounces is that?

A) $128 \mathrm { fl } \mathrm { oz }$
B) $256 \mathrm { fl } \mathrm { oz }$
C) $1024 \mathrm { fl } \mathrm { oz }$
D) $512 \mathrm { fl } \mathrm { oz }$