In England, at a Time When Milk Was Still Delivered

In England, at a time when milk was still delivered to doorsteps each morning in foil-capped glass bottles, a songbird called the great tit started pecking through the caps and drinking the cream in the necks of the bottles. This behavior spread through the great tit population in a matter of years. The emergence and spread of this behavior probably depended on

A) trial-and-error learning plus habituation.
B) trial-and-error learning plus social learning.
C) trial-and-error learning plus imprinting.
D) habituation plus social learning.