Suppose Two Chemical Reactions Are Linked Together in a Way

Multiple Choice

Suppose two chemical reactions are linked together in a way that the O₂ produced in the first reaction goes on to react completely with Mg to form MgO in the second reaction. Reaction one:
2 KClO₃ → 3 O₂ + 2 KCl
Reaction two: 2 Mg + O₂ → 2 MgO
If you start with 4 moles of KClO₃,how many moles of MgO could eventually form?

A) 2 moles
B) 4 moles
C) 6 moles
D) 12 moles
E) none of the above