Answer:
Option 4 - It decreased by 5% every year.  
Step-by-step explanation:
Given :  The number of subscribers y to a newspaper after t years is shown by the equation 
To find : Which conclusion is correct about the number of subscribers to the newspaper?
Solution : 
Equation - 
where y is the subscribers to a newspaper and t is the time in years.
Comparing the given equation with the exponential equation 
75 is the initial number of subscribers to a newspaper and t is the time period is years.
And their is an exponential decay function with rate r=0.05=5% (1-0.95=0.05)
This all imply that :
The number of subscribers to a newspaper decreased by 5% every year. 
Therefore, Option 4 is correct.