Which one of the following reactions represents fission?
a) ^{238}_{92}U + ^{12}_{6}C \rightarrow ^{245}_{98}Cf + 4^{1}_{0}n
b) ^{11}_{5}B + ^{4}_{2}He \rightarrow ^{12}_{6}C + ^{3}_{1}H
c) ^{233}_{90}Th \rightarrow ^{233}_{91}Pa + ^{0}_{-1}c
d) ^{235}_{92}U ++ ^{1}_{0}n \rightarrow ^{146}_{57}La + ^{87}_{35}Ba + 3^{1}_{0}n
e) ^{3}_{1}H + ^{2}_{1}H \righarrow ^{4}_{2}He + ^{1}_{0}n