B. 133.88
Sorry po kung mali
K, ca, sc is the right answer. Take a look at table S of your chemistry reference table.
I believe that when a nucleus undergoes a nuclear decay by gamma rays the atomic number of element remains the same. Atomic number is the number of protons of a given atom of an element. Gamma decay unlike alpha and beta decay does not have an effect on the mass number and atomic number of an atom.