Conclusion:
Opting for the 20% discount is the most favorable choice and it's the only option that fits within the budget.
Analysis:
Let’s consider,
Initial price of the dining set = $1,500,
With a 20% discount,
The discount amount on the dining table = 20% of 1500

= $300
The resulting price of the dining table after applying the 20% discount = 1500 - 300 = 1200 < 1250
This means it stays within budget.
Now, if we consider the $200 rebate,
The new price of the dining table becomes 1500 - 200 = $1300 > 1250,
Thus, this exceeds the budget.
In the case of the $150 coupon,
the revised price becomes 1500 - 150 = $1350 > 1250,
Thus, this also exceeds the budget.