The correct answer is "It shows that using complex words does not necessarily make one's lanuage clearer or more understandable"
Explanation
According to the excerpt from the text "Mother Tongue" by Amy Tan. The author mentions her intention to demonstrate her command of the language by writing one of the lines in her draft of The Joy Luck Club, when she writes "That it was my mental dilemma in its nascent state. " Hence the author states that despite using complex words in this line it is a terrible line and that it is difficult for her to pronounce it, which makes it impossible for her to demonstrate her command of the language since it is not clear or more understandable for readers. So, the correct answer is "It shows that using complex words does not necessarily make one's lanuage clearer or more understandable"