Which of the following is not the cause of backwardness?

Correct option is D

The backward child is defined as one whose educational attainments are from 70 to 85 % of the normal. About 60 % of these children are innately and irremediably dull i.e., their IQ’s are from 70 to 85. In other cases, backwardness is due to.
 Poor health
 Special defects of vision, hearing speech and left-handedness
 Special defects of perception, memory or reasoning
 Temperamental instability
 Sometimes with actual neurotic symptoms Home and school difficulties.