Need help please understanding this question: If I want to compare the proportionate (percentage) contribution of two variables with multiple

Need help please understanding this question:

If I want to compare the proportionate (percentage) contribution of two variables with multiple components to each variable, which chart type should I use? 

Question 31 options:

A) 

Bar chart

B) 

100% component bar chart

C) 

Pie chart 

D) 

Scatter diagram

E) 

Stacked bar chart