The type of graph used to show how a part of something relates to the whole is which of the following? a. circle graph b. bar graph c. line graph d. direct proportion

The Answer is option A.
Circle graph is used to show a part of something relates to the whole. 
There are many types of graphs are used to compare or show the relation between two or more quantities. Graphs are used in many branches of science. The study of graph is graph theory in mathematics. in circle graph we can show circle as whole part and shade or color the part of circle to show the part of whole.

You should see a little paperclip on the bottom left corner you click on it and it gives you two options (camera and gallery)