Answer:
One of the disadvantages of ARM is that payments may go up.
Option: (B)
Step-by-step explanation:
- Adjustable-rate mortgages (ARMs) are the flexible loan system for the buyer of houses. 
 
- For the certain amount of period, the buyer can have the fixed interest and then it gets changed. 
 
- For example, 5/1 ARM means the house buyer has the fixed interest rate for 5 years and then it gets changed according to the index. 
 
- So, the main disadvantage of ARMs is that the payments may rise after the fixed period.