Assume that one ventricle of a child's heart has an EDV of $90 \mathrm{~mL}$, an ESV of $60 \mathrm{~mL}$, and a cardiac output of $2.55 \mathrm{~L} / \mathrm{min}$. What are the child's stroke volume (SV), ejection fraction (EF), and heart rate (HR)?
a. $\mathrm{SV}=60 \mathrm{~mL} ; \mathrm{EF}=33 \% ; \mathrm{HR}=85 \mathrm{bpm}$
b. $S V=30 \mathrm{~mL} ; \mathrm{EF}=60 \% ; \mathrm{HR}=75 \mathrm{bpm}$
c. $S V=150 \mathrm{~mL} ; E F=67 \% ; \mathrm{HR}=42 \mathrm{bpm}$
d. $S V=30 \mathrm{~mL} ; E F=33 \% ; \mathrm{HR}=85 \mathrm{bpm}$
e. Not enough information is given to calculate these.