Final answer:
Waxy flexibility is the state in which a person's body can be put into any posture, even though they have been instructed to resist movement, and is commonly associated with catatonic schizophrenia.
Step-by-step explanation:
In the context of mental health and neurological conditions, the question pertains to different states or symptoms that might affect how a person controls their body. The correct option for the state in which a person's body can be put into any posture, although the person has been instructed to resist any movement, is b) Waxy flexibility. Waxy flexibility is a psychomotor symptom of catatonic schizophrenia where an individual's limbs can be moved into positions that will then be held for an extended period. The other options, such as catalepsy, negativism, and echopraxia, do not accurately describe this symptom. Catalepsy involves muscle rigidity and a lack of response to external stimuli. Negativism is a resistance to attempts to move or instruct the individual, and echopraxia involves automatically imitating another's movements.