By the skin of (one’s) teeth

Do you know the English expression “by the skin of (one’s) teeth“? Read the conversation below. Can you guess the meaning?

Gregory: Did you pass your test?

Rufus: By the skin of my teeth! I passed by one point!

Does it mean:

a) easily

b) luckily

c) narrowly

d) badly

The answer is below!↓

red and white mouth plastic toy and food plastic toys

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Answer: c) narrowly