Infants Are More Likely to Cross a Bridge When It

Infants are more likely to cross a bridge when it is wide and has a rigid handrail than when it is narrow and has a wobbly handrail. Which statement best explains this behaviour?

A) Infants use cues in the environment to judge whether a surface is suitable for walking.
B) Infants use integration to judge whether a surface is suitable for walking.
C) Infants use differentiation to judge whether a surface is suitable for walking.
D) Infants use retinal disparity to judge whether a surface is suitable for walking.