Convert the phrase "illud pulchrum nōmen" to ablative singular.

The phrase "illud pulchrum nōmen" translates to "that beautiful name" in English. To convert this phrase into the ablative singular, it is important to recognize the grammatical roles of the words involved. In Latin, nouns, adjectives, and pronouns can change form based on their case (nominative, genitive, dative, accusative, and ablative) as well as number (singular or plural).

In this case, "nōmen" (name) is a neuter noun of the second declension, and its ablative singular form is "nōmine." The adjective "pulchrum" (beautiful) must also take the correct ablative singular form, which in this case is "pulchrō."

When combined in the phrase to represent "that beautiful name" in the ablative case, the correct form becomes "illō pulchrō nōmine." Here, "illō" is the ablative form of the pronoun "ille" (that), appropriately used to match "pulchrō" and "nōmine" in the ablative singular.

Thus, the correct choice reflects the necessary adjustments to both the noun and the accompanying adjective to maintain agreement and proper case