The answer is letter D (risks of secondhand smoke)
Whose - belonging to or associated with which person.
In Oedipus rex, sphinx symbolises the Oedipus courage, when Oedipus courageously without being scared of the death accepted the riddle of sphinx. He gave the correct answer of his riddle. Which cause him disappear and he died at that very moment.So it was the courage that caused a great set back to the death.
The answer would be "<span>Aiden is thrilled about starting a performance project on Romeo and Juliet, although he worries about getting assigned to a group of students who are poor actors." YOU'RE WELCOME :D
Sorry I took too long to answer :P</span>
