The boiling points of diethyl ether, acetone, and n-butyl alcohol are 35 oC, 56 oC, and 118 oC.
The temperature is converted from celcius to kelvin using the relation:
273 + T (in oC) = T (in K)
273 + 35 oC = 308 K
273 + 56 oC = 329 K
273 + 118 oC = 391 K
Hence, option (c) is correct.