Which Reactant and Product Would Balance the Following Nuclear Reaction $\to$

Which reactant and product would balance the following nuclear reaction equation? reactant + ¹²C $\to$ ¹¹B + product

A) reactant = $\beta$ ^-,product = ¹H
B) reactant = $\beta$ ^-,product = ¹p
C) reactant = $\beta$ ^-,product = ¹n
D) reactant = $\beta$ ^-,product = $\alpha$
E) reactant = ¹H,product = $\alpha$