Joel is writing an essay on famous jazz musicians. joel's research question is: which musicians have had the biggest impact on the
development of jazz? " he has found the following sources:

1. a graph showing the popularity of jazz among americans from 1950 to 2010

2. an opinion piece from a music magazine about changes in jazz over time

3. a recent documentary titled "founders of jazz: the early years"

4. an article from the rock & roll hall of fame website about influential jazz musicians

5. a chart showing five jazz musicians and the number of albums they sold

which two sources would best answer joel's research question?

a. sources 1 and 3
b. sources 3 and 5
c. sources 3 and 4
d. sources 2 and 5