If $0.50$ mol of $Bacl_2$ is mixed with $0.20$ mol of $Na_3PO_4$ , the maximum number of moles of $Ba_3(PO_4)_2$ that can be formed is

Question

$(a)\;0.70 \\ (b)\;0.50 \\(c)\;0.20 \\(d)\;0.10$