Which of the following is wrong?

This book is easy enough for ______.

A. a six-year-old child          B. a child of six years old     

C. a child aged six         D. a six years old chil

. Which of the following is wrong?

This book is easy enough for ______.

A. a six-year-old child  B. a child of six years old 

C. a child aged six  D. a six years old child