What is it called when parts of a sentence share the same gender, number, and person?

The correct answer is agreement. In grammar, agreement refers to the way elements in a sentence align with each other in terms of gender, number, and person. This ensures that the subjects and verbs match in form; for instance, a singular subject should pair with a singular verb, and plural subjects with plural verbs. Additionally, nouns and pronouns must agree in gender (masculine, feminine, or neuter) and number (singular or plural).

This concept of agreement is fundamental in constructing clear and grammatically correct sentences, as it maintains consistency and coherence, allowing readers to easily comprehend the relationships between different parts of the sentence.