It is False that an observer must know that social learning is occurring for it to be effective.
The answer is D, third person. The author uses words such as "he" and "his"
She can fit 3 squares along the 10 inch side and 6 squares along the 18 inch side. When you multiply 3 by 6 you get 18.
The answer is not 20 because you cannot fit 20 3x3 squares.
