Select the most appropriate meaning of the given idiom.

A Herculean task

A task requiring great effort

The most appropriate meaning of the idiom "a Herculean task" is a task requiring great effort.

The other options are incorrect.

• "An important task" is not the same as a Herculean task. An important task is a task that is necessary or significant, while a Herculean task is a task that is very difficult.
• "An immediate task" is not the same as a Herculean task. An immediate task is a task that needs to be done right away, while a Herculean task is a task that is very difficult.
• "A task for brave people" is not the same as a Herculean task. A task for brave people is a task that is dangerous or risky, while a Herculean task is a task that is very difficult.

The idiom "a Herculean task" comes from the Greek myth of Hercules, who was known for his strength and his ability to perform difficult tasks. In the same way, a Herculean task is a task that is very difficult and requires a lot of effort. For example, you might say that climbing Mount Everest is a Herculean task.