I'll offer both @ab_cdef,
I believe people value the ability to make their own choices.
Defaulting a selection may seem like a time saver, but it interrupts the pattern of thinking and selecting.
Default values cannot be scrutinized for authenticity, which weakens their validity and usefulness, which can erode trust in the system.
Some people don't know the right answer, so allowing them to skip a question without requiring them to guess then makes it clear that they don't know, and creates an opportunity for discussion, education, and improvement.
If the default is always the right answer, then calculate and transparently present with its read-only state then confirming It Is What It Is.
But if there is even the slightest chance some other answer would be better, ask, and let people choose.
Regards,
Doug