1. C. Osculate is the word that does not mean hostility. Osculate is a term in mathematics.
2. B. Efface is the word that does not mean a second appearance. To efface means to erase.
3. A. Decapitate is the word derived from Latin word for "head". Capita in Latin means head.
It could be bold print because authors use bold print to signal important information or new words. Hope I’m right :)
He disagreed with his sister on the subject of Trump vs. Clinton.
What is the passage you just read ???