Now it's time to identify our elements and their decay! Here are listed the final weights of the three isotopes after a time equal to their half$-$life has passed:

Uranium$-228=991\mathrm{.}250$ grams

Uranium$-235m=1000\mathrm{.}000$grams

Uranium$-239=999\mathrm{.}999$ grams

What type of decay is each of the isotopes undergoing?

a$)1-$alpha decay, $2-$beta decay and $3-$gamma decay

b$)1-$gamma decay, $2-$beta decay and $3-$alpha decay

c$)1-$beta decay, $2-$gamma decay and $3-$alpha decay