Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false.

Both (A) and (R) are false.

Development is a spontaneous process but appropriate environment is necessary to facilitate it.

Development is pre-determined by genetic factors and cannot be modified.

Heredity does not play any role in development.

The process of development begins only after the stage of infancy.