Which experience was weak in Margie’s study due to the absence of a human teacher?

Correct answer: Social experience

The governing concept is that education includes social development, not merely the delivery of correct lessons. Margie studies alone with a mechanical teacher, so she receives programmed instruction and repeated tests, but she does not share a classroom with other children or learn through ordinary conversation and cooperation. Consequently, her social experience is weak. Option A is therefore correct. Her home experience is not the issue, because the story does not say that her family life disappears. Machine experience is actually strong, since the mechanical teacher controls her lessons. Regular lessons also continue, although the machine sometimes needs adjustment. The important contrast is between efficient solitary study and the lively social learning associated with old schools.