Final answer:
The corect option is C. The best sentence for publication in a public document would be: 'All the new members of Congress attended the opening session.' This sentence is the most inclusive and gender-neutral option, adheres to grammar and punctuation conventions, and ensures subject-verb agreement.
Step-by-step explanation:
The best sentence for publication in a public document would be: All the new members of Congress attended the opening session. This sentence is the most inclusive and gender-neutral option, as it avoids using specific gendered terms like 'freshmen' or 'congressmen'.
It adheres to the conventions of grammar and punctuation and ensures subject-verb agreement by using the plural verb 'attended' to match the plural subject 'members'.