A Carnot engine operates at $55 \%$ efficiency. If the temperature of reject steam is $105^{\circ} \mathrm{C}$, then the absolute temperature of input steam is ____
(a)I and II
(b)II and IV
(c)II and III
(d)I and IV
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.