I choose gbut it is wrong

The spread on the upcoming Philly - Dallas football game is Dallas + 3.5. Suppose the score ends up being Dallas 21, Philly 17. Which of the following is true? O a) If you bet Dallas to cover the spread, you'd win O b) If you bet Philly against the spread, you'd win O c) If you bet Dallas straight up (no spread), you'd win O d) If you bet Philly straight up (no spread), you'd win O e) Both b and d Of) Both a and c O g) Both a and d