The idiom "add fuel to the fire" means to make a bad situation worse by increasing tension, conflict, or problems. Let's examine the options:
(1) Make somebody angry: This could be one interpretation, as anger could be part of making things worse. However, this does not fully capture the meaning of "add fuel to the fire," which is about worsening the entire situation, not just anger.
(2) Make something worse: This option directly captures the essence of the idiom. "Add fuel to the fire" implies making a bad situation even worse, often by contributing to the existing tension or problems.
(3) To start a fire somewhere: This is a literal interpretation, which is not the intended meaning of the idiom. The idiom refers to a metaphorical situation, not an actual fire.
(4) To call for help: This is unrelated to the idiom's meaning. The idiom is about intensifying a negative situation, not seeking assistance.
Therefore, "make something worse" is the correct interpretation of the idiom.