The references and sources like links and phone numbers are provided to add credibility to your response. This is called as citation, which gives an authenticity to the work and saves from plagiarism.
What is citation?
Citation means to give the proper credit to the actual owner of the work by giving proper links, sources,phone numbers and references in the message or articles to maintain the authenticity of the work.
Providing additional sources in the form of citation like from where the data, graph or images has been taken, provides the credibility to your response, as it gives the credit to the person who owns the work.
Therefore, option D, to add credibility to your response, is correct.
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