When discussing subjects that have natural or customary divisions, which speech design is

Consider the statement that appeared in an article on an online news site: "Consent of both the parties are needed before we can record anything that is said in our presence." Which grammar rule does this statement violate?

a) Agreement b) Voice c) Preposition d) Punctuation

In terms of nonverbal communication and culture, what warning do the authors of the text continue to repeat?

a. Watch and learn. b. Don't assume. c. Think quickly. d. Listen and repeat.