Consider two chemical reactions $(A)$ and $(B)$ that take place during metallurgical processes:
$(A)$ $ZnCO_{3(s)} \longrightarrow ZnO_{(s)} + CO_{2(g)}$
$(B)$ $2ZnS_{(s)} + 3O_{2(g)} \longrightarrow 2ZnO_{(s)} + 2SO_{2(g)}$
The correct names for these processes are:

• A
  $(A)$ is calcination and $(B)$ is roasting
• B
  $(A)$ is roasting and $(B)$ is calcination
• C
  Both $(A)$ and $(B)$ produce the same product,so both are calcination
• D
  Both $(A)$ and $(B)$ produce the same product,so both are roasting