Poachers hunt elephants for their tusks, because tusks provide ivory. In $1930$, at a National Park, $1\%$ of the elephants were born with no tusks. The absence of tusks was caused by a gene mutation. At present, in the same area, $15\%$ of the females and $9\%$ of the males are tuskless. Which statements could account for this rise in the number of tuskless elephants?
- A1, 2 and 3
- B1 and 2 only
- C1 only
- D2 and 3 only