Question

a quotation uses the exact words as the original source. enclose the words in quotation marks.
example: you would quote the original source in your research paper like this:
according to shruti jackson, \experts think that residents might be using less electricity to light their homes but using extra energy to power heaters and air conditioners.\
signal phrases are the phrases that tell your reader whom you are quoting. \according to shruti jackson\ is one example. signal phrases can also follow a quotation.

Explanation:

Since the problem (if it's about identifying the relevant subfield for this content) relates to writing and language usage, the subfield under Arts would be Writing (or Linguistics, but Writing is more about the practice of using quotes in writing).

Using the Answer-Explanation Format:

The content explains how to use quotations and signal phrases in writing, which falls under the Writing subfield of Arts as it deals with writing conventions and academic writing skills.

Answer:

Arts - Writing (subfield)