Girls who are tall usually long to be dainty and small, and vice versa; plump girls with rosy round faces would love to be pale and delicate; slender girls with very white skin hate their pale and colourless look.
What do dainty and small girls want to be?
Dainty and small girls want to be tall.[adjective complement]
Dainty and small girls want to be tall girls.[noun complement]
Which will be appropriate answer for this type of "What" question, "adjective" or "noun"?