Which of these actions involve use of explicit consciousness? (select all that apply.)
listening to music
working on a history test
solving a sudoku puzzle
riding a bike

The correct answers are working on a history test and solving a sudoku puzzle.

The reason for this is because you can listen to music and don't need to be explicitly conscious - imagine drifting away in thoughts while you listen to music, or do something completely unrelated.

The same goes for riding a bike. Once you know how to ride a bike and know the path where you're going, your attention and explicit consciousness can be allocated somewhere completely else :)

The correct answers are the middle two - because of them require you to be present and attentive of the situation and what you have to do.