A Pure Substance a Is Found to Change Upon Heating $\rightarrow$

Multiple Choice

A pure substance A is found to change upon heating into two new, pure substances, B and C.
A $\rightarrow$ B + C
Neither B nor C can be decomposed by chemical means. From this we may conclude that ________.

A) A is an element, B and C are compounds
B) B is a compound, A and C are elements
C) B and C are elements, A is a compound
D) A, B, and C are all compounds