Which of the following groups on the references tab contains the command to insert a table of figures?
a) table of authorities
b) captions
c) footnotes
d) table of contents

Captions group under References tab contain the command of "Table of Figures".

Explanation:

Whenever a document is created using standard setting then for explanation of your information images are also added into the document and there caption is also given like what is the image number or what image describe.

So using these caption we can create table of figures in the top tool menu of word select "References" tab then under captions we can create table of figures and can access any image directly from this table there is no need to scroll a long document to view a image just click on the image name/caption in the table of images and word will take you to that image.

I hope it will help you!