What Do Modified A-Not-B Experiments That Involve Manipulations of Infants

What do modified A-not-B experiments that involve manipulations of infants' posture demonstrate?

A) The impact of sensory feedback is an important consideration when conducting A-not-B experiments.
B) Reaching for a specific location may be the result of an automatic reflex.
C) Infants do better at A-not-B tasks when they are standing.
D) Infants continue to search for objects in the same location until they are taught otherwise.
E) Infants can succeed in A-not-B tasks with a little help from the experimenter.