In her speech, Vanessa stated, It is important that leaders are not overly autonomous or merely satisficing when using a combinatorial rather than positional decision-making process. What mistake did she make in her language choice?

B. she did not emphasize clear, familiar language

Explanation:

Clear language is the language which as clarity and easily understandable trait for speaker as well as listeners. Familiar language is the language that is common among people and they know about the language .These traits help in easy and effective communication.

According to the question, Vanessa chose more complex words and language for giving speech which might be difficult for audience.She should have chosen a familiar language that has more clarity and understandable factor among people in audience so that they can relate with value and meaning of speech.  

i dont know this man

well this isn't a question but if you are asking if it is true or false it is, true.