Research Using Shallow and Steep Inclines Has NOT Demonstrated That

Research using shallow and steep inclines has NOT demonstrated that:

A) inexperienced crawlers are poor judges of what they can and cannot handle.
B) infants are able to transfer judgment skills learned as crawlers to walking.
C) experienced crawlers will disregard parents' encouragement when it is inconsistent with their own judgment.
D) infants have to learn from experience what they can and cannot do.