16.985 in word form is sixteen and nine hundred and eighty five thousandths.
Diana went to Hawaii. She saw many fish in the ocean. She ate delicious food. She liked her trip very much. She had a really great time. She liked her trip very much.
"Latin terminology" is the correct answer, because legal English uses formal language, and Latin words are, of course, very formal. "Common vocabulary" is quite informal, there is no reason to use "archaic words", and legal English rarely uses "simple sentences", but rather very complex ones.