Which of the Following Statements Regarding Nuclear Stability Is Incorrect

Which of the following statements regarding nuclear stability is incorrect?

A) Isotopes with excess mass tend to undergo alpha decay.
B) Isotopes with an N/Z ratio that is too high tend to undergo beta decay.
C) Isotopes with an N/Z ratio that is too low tend to undergo either positron emission or electron capture.
D) Electron capture is the most common mode of decay for smaller isotopes.
E) An energetically excited nucleus can undergo gamma emission.