Synonym

The American dream is the belief that anyone can attain their own version of success in a society in which ? upward mobility is possible for everyone. It is a dream of social order in which each man and woman shall be able to attain to the fullest ? stature of which they are innately capable, and be recognized by others for what they are, regardless of the ? fortuitous circumstances of birth or position.

Which of the following pairs includes an expression that CANNOT replace the underlined expression in the passage?

? ? upward mobility, social climbing

? ? stature, status

? ? fortuitous, inherited

I think the answer is ?, but my friend says the answer is ?.

Thank you in advance.