How to set the comment body field to be required? I have created a comment section in my node. But it is not displaying the required option. if the comment is posted no validation occurs.
For What ever content type you are giving comments options, you need to go to 

structure &gt;&gt; Content types &gt;&gt; Edit the particular content type &gt;&gt; there will be comments fields tab &gt;&gt; over there  will be list of comments field, in that    comment_body(machine name) wil be required by default. 

If not, make it required by editing that field.