Concept:The blanks need words that match the meaning of the passage: stepping out of a safe routine, facing fear, finding it harder than expected, and expecting huge personal development.
Explanation:First blank: “out of my ______ zone” — the common phrase is “comfort zone,” so “comfort” fits.
Second blank: “it did not ______ me” — the context says the challenge did not cause fear; “scare” is correct.
Third blank: “it was ______ than what I imagined” — the speaker found it more difficult, so “tougher” works.
Fourth blank: “thinking about the ______ growth” — the ending is optimistic, expecting big progress; “massive” means large and positive.
All other options fail because they use words that do not match the passage (e.g., “cheer,” “gloomy,” “easier,” “trivial”).
Answer:Option C: comfort, scare, tougher, massive