Step 1: Understanding the Idiom
The idiom "bring to light" means to make something known or to disclose information that was previously secret, hidden, or unknown. Light is used metaphorically for knowledge and visibility.
Step 2: Evaluating the Options
(A) Reveal: This means to make (previously unknown or secret information) known to others. This is a direct synonym for the meaning of "bring to light." For example, "The investigation brought to light new evidence" means the investigation revealed new evidence.
(B) Speak loudly: This is a literal action and has no connection to the metaphorical meaning of the idiom.
(C) Switch on: This is a literal action, usually referring to a device. While it creates light, it's not the meaning of the idiom.
(D) Seen: This is a state of being visible, but the idiom is an action of making something visible or known. "Reveal" is a better fit for the action.
Step 3: Final Answer
The best meaning for "bring to light" is to reveal something. Therefore, option (A) is the correct answer.