Which sentence from the passage is a complex sentence?
a. after the 1950s, jazz continued to change and branch into new subgenres.
b. trumpeter miles davis and pianist herbie hancock are some famous jazz musicians from this time period.
c. in the 1930s and 1940s, jazz music began to adopt the big band sound.
d. the style of jazz changed as well when bebop became dominant jazz form and sound.