According to the balanced chemical equation: CaCl₂ (aq) + Na₂CO₃ (aq) → CaCO₃ (s) + 2NaCl (aq)

What is the theoretical yield of CaCO₃ (s) if 3.4 grams of Na₂CO₃ is used to react with excess CaCl₂? The molar mass for CaCO₃ is 100 g/mol and the molar mass for Na₂CO₃ is 106 g/mol. (Round and report your answer to the first decimal place, do not include unit)

a) 3.0
b) 6.0
c) 12.0
d) 15.0