Answer: Option(a) is correct
Step-by-step explanation:
Organic failure to thrive(FTT) is the metabolism medical disorder that is present in a person from the time of birth. It can cause malabsorption, metabolism problem, etc.
According to the question,Sarah's problem of weighting less than other children of her age and malabsorption of food describe about organic failure to thrive.
Other options are incorrect because interstitial dwarfism, Munchhausen's syndrome through [proxy or non-organic failure is not depicted through Sarah's state.Thus, the correct option is option(a).