It is said thet Mendel proposed that the factor controlling any character is discrete and independen. His proposition was based on the
A. results of `F_(3)` generation of a cross
B. observations that the offsprings of a cross made between the plants having two contrasting characters show only one chyaracter without any biending
C. self pollination of `F_(1)` offsprings
D. cross pollination of parental generations
