Which musical quality of bossa nova led to charges of the genre seeming "out of tune?"
a. The use of semipitched instruments such as the cuíca that occupied the realm between specific notes and percussion.
b. The use of English-language lyrics by vocalists such as Astrud Gilberto.
c. The incorporation of complex harmonies and atypical, difficult-to-sing melodies derived from modernist composition and jazz.
d. The use of chest voice vocal techniques that seemed inappropriate for the intimate settings of Rio cafes.
e. All of the above.