Which phrase defines “imminent” best? giving satisfaction or pleasure ending or achieving a final stage horrified or shamed about to happen, impending

The definition of the word imminent is "about to happen.", or close to happening. Here's a sentence to demonstrate the definition. "It was the last day of school and the students knew that the beginning of summer break was imminent." Another example would be "The rattlesnake does not always rattle when the strike is imminent."

The answer is "D. About to happen, impending"

I’m not sure about that