The correct answer is A) The Electoral College may not produce a final decision, leaving the choice to the House of Representatives.
The Electoral College is the system that determines who is president in the US. This system essentially assigns a number of electoral votes to each state based on their population. In this system, it is possible for none of the candidates to win outright. This is due to the fact that a person needs a majority of the electoral college votes in order to win (aka 270).
If this does not happen, the case then goes to the House of Representatives. Some people would argue that this makes the electoral college an ineffective system, as the House of Representatives would choose the president not the citizens.