[单选题]
At what rate is the human body radiating en983k(cs.u dn jct9ui oergy when it i- v8a,q o.v5w7fxt jd+x4sku 7u xjgl1s at $33 \; ^{\circ}C$? Take the body surface area to be $1.4 \; m^{2}$, and approximate the body as a blackbody.
A. $600 \; W$
B. $700 \; W$
C. $800 \; W$
D. $900 \; W$
