The answer is B.
A cannot be the answer is melting is a physical change. No chemical reaction took place.
B is the answer as it is a EXOTHERMIC REACTION so heat will be given off.
C cannot be the answer as dissolving is basically atoms becoming ions, not a chemical reaction whereby a reactant reacts with another reactant to form a product.
D cannot be the answer. Same reason as for why A is not the answer.
Cheers.
C., used in power plants I think.
Answer:
They would be pointing in the same direction
Explanation:
If they were facing each other then it may seem like they are pointing in different directions they would still point the same way.
