Six-month-old Luka's weight, height, and head circumference are substantially below age-related growth norms. Luka is withdrawn and apathetic. Luka's mother sometimes appears depressed and distant, at other times impatient and hostile. Luka most likely suffers from:___________.
A) growth faltering.
B) malnutrition.
C) marasmus.
D) food insecurity.