Which of the following is true regarding a restrictive adjectival clause?
a. it will follow a proper noun.
b. it will follow a general noun and is not set off by commas.
c. it will be set off by commas.
d. it will typically include the relative pronoun which.

to and without are prepositions, so a, b, and d are prepositional phrases. the adverb phrase is c, about the surprise.

explanation:

harlem's  cotton club boasted the talents of duke ellington. singers such as bessie smith and billie holiday popularized blues and jazz vocals. jelly roll morton and louis armstrong drew huge audiences as white americans as well as african americans caught jazz fever.