Answer:
The phrase "I do not have the money" is considered the data of the argument.
Explanation:
According to the Toulmin method of reasoning, there are three essential parts for an argument. The claim is the speaker's position or opinion concerning the subject at hand. The data are evidences provided to support the claim, the grounds on which the claim is founded. The warrant is the interpretation that connects the claim and the data. Most of the times, in informal interactions specially, the warrant is implied. In written argumentative texts, on the other hand, the warrant is explained in subsequent lines.
In the sentence "I shouldn’t buy a new shirt because I do not have the money,” the speaker has the opinion that he/she shouldn't buy a new shirt. That is the claim. The speaker then offers the evidence that will support such opinion, and it is the fact that he/she has no money. The warrant would be something of the sort "people who do not have money cannot buy new things". Therefore, the phrase "I do not have the money" is the data, the evidence for the claim.
