B ) a decrease in the supply of consumer goods
        
             
        
        
        
This condition is called presbyopia.
Presbyopia refers to the condition where individuals aged 40 and above have a deterioration in their ability to see nearby objects. They experience difficulty in tasks like reading and typing. P<span>resbyopia occurs due to reduced elasticity in the lens of the eye as a result of aging. This is why individuals with previously normal vision often require "reading glasses" after their 40s .</span>
        
             
        
        
        
Answer:
D) the value of the services of the real estate agent
Explanation:
Real estate are not included in the calculation of GDP. However, their related services such as the services of an agent is included in GDP calculation.