[单选题]
The efficiency of a Car) 0fgvtm 3jn 6t*lmzy+not engine is 35.0 dialykzw2s )w3s/80i %. What is the temperature of the cold resezkl d i38 )i2wy0sa/wsrvoir if the temperature of the hot reservoir is $500 ^{\circ}K$?
A. $175 \; K$
B. $325 \; K$
C. $269 \; K$
D. $231 \; K$