To determine the correct answer, it is important to understand the context of points B to C in a phase change diagram (like a temperature vs. heat added curve).
If points B to C represent a phase change from a solid to a liquid (melting), the heat added is primarily breaking the bonds of the solid (answer C).
If points B to C represent a phase change from a liquid to a gas (boiling), then the heat is used to break the bonds of the liquid (answer B).
If points B to C represent warming up either a solid or a liquid without a phase change, then it may be associated with increasing the temperature (answer A).
If points B to C represent the boiling phase, then the answer would be D.
Without more context, it is difficult to select the correct answer, so please clarify the phase change happening between points B and C. However, if we presume B to C is indicative of a phase change (like melting or boiling), you would then choose accordingly.
For example, if moving from B to C indicates boiling, then:
Answer: D. boil the substance
If moving from B to C indicates melting,
Answer: B. break the bonds of the liquid
If it’s simply temperature increase without changing phase:
Answer: A. increase temperature
Let me know if you need clarification on a specific phase change!