Select the sentence containing the homonym of the highlighted word:
The prince’s gules stood out clearly on the family coat of arms.

The correct option is:
"The cook served a dish with a sauce of rich gules and cumin."

Step-by-Step Explanation:

1. Understand the Highlighted Word in Context:
In the given sentence, "The prince’s gules stood out clearly on the family coat of arms," the word gules refers to the color red used as a heraldic tincture in coats of arms and banners.

2. Define a Homonym:
A homonym is a word that shares the exact same spelling and pronunciation as another word, but has a completely different meaning and origin. Therefore, we need to identify the sentence where gules is used with a different meaning altogether (not related to heraldry or the heraldic red color).

3. Analyze the Given Options:

• Option 1: "The shield displayed gules and argent in bold patterns."
Here, gules refers to the heraldic red tincture on a shield. This carries the same meaning as the original sentence, so it is not a homonym usage.

• Option 2: "The cook served a dish with a sauce of rich gules and cumin."
Here, gules is used in a culinary context referring to an ingredient, spice, or dish element (unrelated to heraldry). Because the spelling and pronunciation are identical but the meaning is completely different, this sentence contains the homonym of the highlighted word.

• Option 3: "The gules trim on the banner represented a warrior tradition."
Here, gules refers to red heraldic trim on a banner, which is the same heraldic red meaning as in the prompt.

• Option 4: "The guide described the meaning of gules to the audience."
Here, gules again refers to the heraldic term being explained by a guide.

Conclusion:
Option 2 correctly uses gules with an entirely different meaning from the heraldic tincture used in the prompt sentence, making it the correct homonym sentence.