Why Did Early Farmers Select Grain Plants with Nonshattering Heads

Why did early farmers select grain plants with nonshattering heads to cultivate?

A) seeds produced in nonshattering heads were not eaten by herbivores
B) seeds produced in nonshattering heads did not have mutations
C) seeds produced in nonshatttering heads were not scattered on the ground
D) seeds produced in nonshatterring heads were larger and tastier
E) all of these are reasons why farmers selected plants with nonshattering heads