Presenting information

ABC produces three main products

Which would be the most appropriate chart or diagram for showing total revenue and product analysis month by month?

A) Z Graph
B) Line Graph
C) Pie Chart
D) Component bar chart

The correct answer is D

My answer and doubt

My doubt is why couldn’t B) be the answer
Because line graphs usually is plotted against the x and y variable which is usually the case of
Dependant and independent variable

(Sales usually depend on month)

Therefore I chose the answer as a scatter graph because all the conditions were satisfying

Please help me figure out where i have went wrong sir