Which of the following are correct ways of providing evidence to support the thesis of a research paper?
use direct quotations from experts on the topic.
link relevant portions of your paper to blog sites on the same topic.
discuss the topic with your classmates and include their opinions.
obtain more information on the topic from published sources.
include paraphrased text from authoritative sources.

I take it that I can choose multiple options here:)

Let's look at all the options:

Use direct quotations from experts on the topic.
-yes! this is a good idea. Experts are reliable and quoting them will support your thesis.

Link relevant portions of your paper to blog sites on the same topic.
-no, I don't think so: unless the blog sites are by experts, they don't have to be reliable.

Discuss the topic with your classmates and include their opinions.
-in general, no, since your classmates are not experts on the topic. Except when they are: if, for example your research paper researches social interaction between them

.Obtain more information on the topic from published sources
-yes, a very good idea!

Include paraphrased text from authoritative sources.
-yes, a very good idea! These sources could be for example experts in the field!