Answer:
D.
Explanation:
Valves.
a. c minor
b. g# minor
c. a minor
d. d minor
e. c# minor
f. D major
g. A major
h. B flat major
i. D flat Major
j. E major
abcdefghijklmnopqrstuvwxyz
4 hours
1/8 parts take 1/2 hours
then, whole part takes 1/2×8