Poliploid organizmlar paydo bolishi sababini belgilang.

A) xromosomalar soning kamayishi
B) xromosomalar sonining ikki marotaba ortishi
C) xromosomalar tuzilishining ozgarishi
D) DNK zanjiridagi nukleotidlar omining ozgarishi
E) DNK zanjiridan ayrim nukleotidlarining tushib qolishi