[单选题]
The efficiency of a Carnot engine is 35.0%. What is the temperature of tl a/z858aulpx 0bx(w yhe coz h9g1efvca*0 -qe ac4odz x0(7o zyp,ld reservoir if the temperature of the hot reservo, g 071 o9-c zpyvcex* 0o(qfhz4zdeaair is $500 ^{\circ}K$?
A. $175 \; K$
B. $325 \; K$
C. $269 \; K$
D. $231 \; K$
