I thought the stunts and action scenes in that movie were great! It must have been very ____________ for the stuntmen to do some of them.

The correct answer, "dangerous," fits well in the sentence because it accurately describes the nature of the stunts and action scenes performed by the stuntmen. The word "dangerous" is an adjective that conveys a sense of risk and potential harm associated with those activities. It directly modifies the subject of the sentence, referring to the experiences of the stuntmen while performing their tasks.

In contrast, "danger" is a noun that wouldn't grammatically fit in the blank because the sentence structure requires an adjective that describes the stunts themselves. "Daring," while also an adjective, suggests a sense of bravery or audacity rather than focusing on the inherent risk involved. Lastly, "hazardous" is another adjective that could describe something harmful, but it is less commonly used in everyday conversation compared to "dangerous." Therefore, "dangerous" is the most appropriate choice to convey the intended meaning in this context.