This book is  ________for a six-year-old child to read.

A．enough easy       B．enough easily      C．easy enough       D．easily enough

This book is         for a six-year-old child to read.

A. easily enough      B. enough easily      C. easy enough                  D. enough easy

This book is         for a six-year-old child to read.

A. easily enough      B. enough easily      C. easy enough                  D. enough easy