Which sentence contains the main idea in a paragraph?

Which of the following sentences uses dashes correctly? a. i looked under the bed - get this - and there it was! b. i need - a lot of - colors for this painting. c. i can't believe my own - brother! - is now a mayor. d. tom and i - are planning - a wedding in june.

Don't eat the mushroom its poisonous

Who dies in a duel because of his pride and his anger