Which of the following statements about vocabulary building is not correct?
a. reading on a daily basis is very important for building your vocabulary.
b. pronunciation is an important part of adding new words to your vocabulary.
c. using the dictionary is only one step in the process of vocabulary building.
d. the best way to improve your vocabulary is to memorize lists of vocabulary words.

I'm actually not sure about the answer here. I am certain that A and C are correct answers, as reading is definitely important for word building, as well as using a dictionary is. But B and D are dubious. Because, when you don't know how a certain word is pronounced, you will usually look it up in the dictionary, you will see the way it is pronounced, but also what it means, so that way you can build your vocabulary. And again, if you memorize lists of words, it is a way of building your vocabulary. So the incorrect sentence is either B or D.