Is your interview as a CFI -ME?
in that case the real signifigance of the lowered VMC [many training twins far23] have only one Vmc and many times it's very near-or below- the stall speed so as the engine power is reduced with the temperature ratio at a certain point Vmc will be lower than the stall speed-on the ground this is fine- but for the required Vmc(a) demonstration it cannot be done and as it is required for the test standard--you have to use your feet to block the student's pedals and create a fake vmc.
in this application only does the question makes sense to me,
otherwise a very silly interview question IMHO