Scenario A- the electors will meet and cast ballots for President
How are the electors chosen?
[link:
https://www.archives.gov/electoral-college/electors|]
Generally, the parties either nominate slates of potential electors at their State party conventions or they chose them by a vote of the party's central committee. ... When the voters in each State cast votes for the Presidential candidate of their choice they are voting to select their State's electors.
No election means no official selection of electoral college electors. This would mean that there would be no chosen official electors to meet and chose a President.
Scenario B- the electors will meet and cast ballots for President
See above about how electors are chosen.
Scenario C- the GE is not what selects the President. The electors will meet and cast ballots for President (I would have hoped we have learned this by now)
See above about how electors are chosen
There is one way to change the date of the end of a President's term- a new Amendment.
I never asked about changing the end of a President's term in the Constitution. The Supreme Court effectively chose the President after the 2000 election, and they did not need to change a thing in the Constitution in order to do it. If the Republicans want to change the election date, and the Democrats do not, it may not end there. If people are sick all over the country, and many cannot make it to the polls, the Democrats may feel extremely pressued to move the election date back.