Answer: Option A
An idiom is a phrase or expression whose meaning cannot be inferred from the literal definition of the words that make it up. Instead, it has a figurative meaning that is often culturally specific. The given idiom "dashed my hopes" means that something has caused disappointment or frustration by failing to meet expectations.
To understand the meaning of the given idiom, it's important to understand the definitions of the words used in it. The word "dash" means to destroy or frustrate something, and "hope" refers to a feeling of expectation or desire for a particular thing to happen. When someone's hopes are dashed, it means that their expectations have been frustrated and they feel let down.
Therefore, the correct meaning of the given idiom is to frustrate or disappoint, as it implies that the result of the examination was not what the speaker had hoped for and has caused them to feel let down.
In conclusion, the correct option is A, frustrate. This idiom is commonly used in informal English, and understanding it can help improve your ability to communicate effectively in everyday conversations.