D. Smallpox is your answer
There are many primitive reflexes for infants, but some of them are the walking/stepping reflex (they will attempt to walk by abruptly placing one foot out), rooting reflex (looking for a base or the nearest object to latch onto because infants are always looking for the breasts to breastfeed from their mothers), and swimming reflex (if placed over water, the infant will paddle their arms and legs).
Psychological assessment is needed in certain cases where we're trying to determine certain psychological characteristics of the person we're assessing. This becomes increasingly important in cases where there is a HR department or something similar.
