When learning a new concept, children are most likely to learn the first.
a. basic-level category
b. superordinate category
c. hierarchy
d. subcategory?

I believe the answer is: A. basic level category
basic level category of information refers to the type of information that is the most general and easiest to understand.
Children tend to learn this first because their ability for cognitive thinking still hasn't as developed as average adults.

a. Fixed-Interval Schedules

b. Fixed-Ratio Schedules

c. Variable-Interval Schedules

d. Variable-Ratio Schedules

Explanation:

a) Reinforcement occurs after a set time period (Fixed-Interval Schedules)

b) Reinforcement occurs after a set number of responses (Fixed-Ratio Schedules)

c) Reinforcement occurs after a varying time period (Variable-Interval Schedules)

d) Reinforcement occurs after a varying number of responses (Variable-Ratio Schedules)