Final answer:
The longest expansion in the United States since 1925 lasted 128 months.
Step-by-step explanation:
The longest expansion in the United States since 1925 lasted 128 months.
According to the information provided, the longest expansion in the United States since 1925 lasted 128 months. This expansion started in June 2009 and ended in February 2020. It was the longest on record. The correct answer is D. 120 months.