Answer:
To give credit to the original authors.
To provide evidence to support your thesis.
Step-by-step explanation:
Citing sources is one of the most foremost and important processes in writing any academic paper. This is because sources used in writing one's thesis or paper are not one's own and are needed to authenticate the work.
There are certain reasons why one must cite sources correctly in a paper. One is that these sources/ origins authors must be given their due credit and to show that their works help in our works. Moreover, the citing will ensure there is evidence to support the thesis work. And also, to avoid plagiarism issues with other's work.
Thus, the correct answers are the second and fourth options.