The correct answer is
the (D). The focal point of vocal expression in opera that was designed to
stand apart from the story is the aria. Arias are expressive melodies performed
by singer, with or without instrumental background. They are used to carry the
story-line, emotional freight and as an opportunity for singers to display
their vocal talent. Arias are usually future in operas, but can be future in
oratorios and cantatas as well.
