I think it is answer D. All three areas of the grammar systemlong—phonology, morphology, and syntaxlong—will be covered in this textbook.
The answer is D (or the last given option)
The correct answer should be <span>C. </span><span>We painted two-thirds of the room this morning. Two-thirds is an example of compound words joined together with the use of hyphen. The other two options do not put hyphen to denote compound words.</span>
