To find out how much the stadium paid for the T-shirts, you can multiply the number of T-shirts by the cost of each T-shirt.
The stadium gave away 100 T-shirts and each T-shirt cost $15.00:
\[ 100 \text{ T-shirts} \times 15 \text{ dollars/T-shirt} = 1500 \text{ dollars} \]
So, the stadium paid $1,500.00 for the T-shirts it gave away. The correct answer is $1,500.00.