52. If the writer were to delete the underlined portion, the sentence would primarily lose:

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

The middle of the double dash is to explain the content of amphoras,

Item G: "A definition clarifies a term that is not widely known", correct.

Item F: "An unnecessary explanation about how red wine was transported in ancient times", does not meet the meaning of the underlined part.

Item H: "An interesting detail about the dangers of ancient shipping", does not meet the meaning of the underlined part.

Item J: "A historical detail and information that is not relevant to the description of the wreck in this paragraph", does not meet the meaning of the underlined part.