Final answer:
The trend in sales of Volkswagen's in Nevada is that the sales have increased by 10% each year.
Step-by-step explanation:
The trend in sales of Volkswagen's in Nevada is that the sales have increased by 10% each year.
This information is not explicitly stated in the given reference from the Wall Street Journal. However, it can be inferred by the fact that the sales have grown steadily over the past 5 years and there is no mention of a decrease or fluctuations in sales.
Therefore, option 1) The sales have increased by 10% each year is the most likely trend in sales of Volkswagen's in Nevada.