Who introduced the concept of reinforcement into behaviorism?

An experimental design would be most useful in answering which of the following questions?

A) Does height affect basketball ability? B) Does birth order impact education? C) Do shy newborns become easy-going adults? D) Does viewing violence impact eating choices?

In traditional cultures such as Uganda, _________ can be a major event in the lives of toddlers and it may have an influence on the security of attachment

a. beginning to eat solid food b. weaning c. learning to walk d. being away from siblings who are working or at school