Arrow's theorem demonstrates that elections cannot be the perfect means of making decisions because of which of the following? Select one:

a. The way votes are tallied can significantly alter the outcome.

b. Too many people do not vote.

c. Corruption is an inevitable part of politics.

d. Elections are always confusing to many people.

a. The way votes are tallied can significantly alter the outcome

Explanation:

According to Arrow's Impossibility Theorem, there are three possibilities:

1. in case each voter prefers alternative X over alternative Y, it means the group prefers X over Y;

2. in case each voter's preference between X and Y remains unchanged, it means the group's preference between X and Y will also remain unchanged;

3. in case no single voter has got the power to always fix the group's preference, it means there is no dictator.

In making decision, election is not a perfect means since the way votes are calculated there is a room for discrepancy.