Answer: D
Explanation: Every other answer says “I”, when writing a hook, you never say I, but instead get the reader interested with facts.
Rosetta stone is a good app or just use google translate
I believe the answer is post-traumatic stress disorder
Dictionary: To find the definition of a word.
Pronunciation Key: A guide indicating how words are pronounced.
Guide Words: Indicating the alphabetical first and last words on the page.
Thesaurus: To find the synonym and/or antonyms of a specific word.