What is the overall reaction order for the following rate law: rate = k [a]2 [b]

zero
first
second
third

Which statement best identifies the process shown? the process must be fusion because energy is released. a.the process must be fusion because a heavier nucleus forms from smaller nuclei. b.the process must be fission because a large nucleus breaks into smaller nuclei. c.the process must be fission because neutrons are formed.