The temperature of an object is observed to rise in a period. In this period
(i) Heat is certainly supplied to it
(ii) Heat is certainly not supplied to it
(iii) heat may have been supplied to it
(iv) work may have been done on it.

Options

A. heat is certainly supplied to it
B. heat is certainly not supplied to it
C. heat may have been supplied to it
D. work may have been done on it

Answer

C, D

Explanation

heat may have been supplied to it,work may have been done on it