Answer:
Decrease in the interest rate 
Explanation:
Present value is the sum of discounted cash flows
let me use an example to illustrate 
the present value of $100 in year 0 discounted at 6% = $100
the present value of $100 one year from now discounted at 6% = $94.33
the present value of $100 two years from now discounted at 6% = $89
We can see that present value decreases with an increase in time
2. the present value of $100 one year from now discounted at 6% = $94.33
the present value of $90 one year from now discounted at 6% = $84.91
We can see that present value decreases with a decrease in the future value.
3.  the present value of $100 one year from now discounted at 6% = $94.33
 the present value of $100 one year from now discounted at 5% = $95.24
We can see that the lower the discount rate, the higher the present value