This is very similar to lectio difficilior potior in textual criticism! I.e. if you have no other evidence, then the difficult reading is the stronger one.
Tangentially, I noticed the strongest version of this was when the testmaker added some sort of clarification or hedging to one of the answers (like stating “all other things being equal” or the like). Very unlikely you’d just add that to a wrong answer!
This is very similar to lectio difficilior potior in textual criticism! I.e. if you have no other evidence, then the difficult reading is the stronger one.
Tangentially, I noticed the strongest version of this was when the testmaker added some sort of clarification or hedging to one of the answers (like stating “all other things being equal” or the like). Very unlikely you’d just add that to a wrong answer!