Answer
b. is true
Work Step by Step
a. We do not have any information about molar masses.
b. 2 moles of B produces 2 moles of C.
In order to produce 2 moles of C, you need 6 moles of A.
c. As we see above, A is the limiting reactant.
d. As we see above, A is the limiting reactant.
e. As we see above, A is the limiting reactant.
