Although she wanted to be in the play: she lacked self-confidence, so she didn't think she would get the part. a. Although
C. self-confidence,
b. play:
d. didn't

a.Although

Explanation:

THe main difference between Although and even thoug, is that Even though creates a more emphatic situation in the dependant clause, and what happens in the sentence need more emphazis, because she wanted to be in the play, but lacked the confidence necessary to even audition because she felt like she wasn´t enough to get the part, so the answer would be A. Although.

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.