I am doing multiple-choice tests and this is the exercise I am facing at the moment:
I can see that there is some rot in the wood, but I need to remove the plaster to check the A) rank B) extent C) degree D) grade of damage.
According to the answer key, the correct one here is extent. However, websites like ludwig.guru show me that the phrase works perfectly with degree as well.
Is this a case of people using the phrase even though it is not idiomatic?