One Gram of Mannitol Was Injected into a Woman $0.08 \mathrm{~g} / \mathrm{L}$

One gram of mannitol was injected into a woman. After equilibration, a plasma sample had a mannitol concentration of $0.08 \mathrm{~g} / \mathrm{L}$ . During the equilibration period, $20 \%$ of the injected mannitol was excreted in the urine. The woman's

A) extracellular fluid (ECF) volume is $1 \mathrm{~L}$
B) intracellular fluid (ICF) volume is $1 \mathrm{~L}$
C) ECF volume is $10 \mathrm{~L}$
D) ICF volume is $10 \mathrm{~L}$
E) interstitial volume is $12.5 \mathrm{~L}$