The subject of a text is its topic. Therefore, Option D is correct.
What is the topic ?
A topic can be defined as the subject of something. From the dictionary of Macmillan, topic can be understood in terms such as "a subject you write or speak about."
The topic can be anything, including debate, essay, and many others. Some of the topics are simple and easy to understand, whereas some of them are quite complex. Most of the time, a topic is described with just a word or a phrase.
Therefore, Option D is correct.
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