A

The excerpts from “A Modest Proposal” by Jonathan Swift that use quotation marks properly are:
A) Swift explains that landlords “seem to have the best title to the children.”
D) Swift writes, “I think the advantages by the proposal which I have made are obvious and many, as well as of the highest importance.”
E) “This food would likewise bring great custom to taverns,” Swift writes.

Explanation:

These sentences are actual quotes, rather than a re-telling of Swift’s words.

In English, the symbol of the inverted commas is used to showcase dialogue or a word-for-word excerpt from any written work.

The actual definition of a quotation mark is that of an element of punctuation, which is supposed to indicate direct speech.

In sentences, such symbols are used to demonstrate knowledge of precisely what has been said without losing any meaning. Based on what is happening next in the sentence, commas and periods may either end a quote or allow the writer to add a few concluding words and explain the meaning of it.

How to Quote - rules.
How to Quote (Source: https://www.thebalancecareers.com)