Which is a major flaw in the electoral college system?

Electors are not required to vote for the candidate who wins the popular vote.

Explanation:

The United States Electoral College is the electoral college that chooses the United States President at the end of each US presidential election. The American Electoral College was established by Article 2, Section 1 of the United States Constitution. The college meets every four years with "large voters" (delegates who are elected by the "small voters" who are ordinary citizens) from each state. The major shortcoming of the electoral college is that large voters do not have to vote for the candidate who wins the popular vote, for president, and end up electing someone who was of what the majority of the population found appropriate for the office.

d. direct

both include an amendment process.