Question

The following sentence contains four parts, marked a, b, c, and d. One of these parts is incorrect. Indicate the letter of the incorrect part.
They cannot go camping right now because they are taking care of a three-weeks-old baby.

Options

• They cannot go camping right now

• because

• they are taking care of

• a three-weeks-old baby

Answer 1

When age precedes a noun then it is hyphened and the number of age remains singular. Example: '12 years old' but 'Twelve-year-old.'
Hence, 'a three-weeks-old baby' is the correct option.