The answer is B.
A. False. Heterotrophs need to consume other organisms to make energy.
C. False. Thermophiles (notice the prefix 'thermo') are organisms that thrive at higher than normal temperatures.
D. False. Autotrophs make their own energy. They don't consume it from other sources.
Answer:
Secondary
Explanation:
There are several levels of prevention. You might confuse this with primary prevention. Primary prevention is preventing infection, so it has to be done before the patient caught the disease.
The needle-exchange program aims to reduce the spread of blood-borne disease(HIV, hepatitis, etc) from the multiple usages of the same needle. Since the disease already exists, this will be secondary prevention.