The actual number of seats in the house is fixed. The only number that changes is the number of Republicans or Democrats that win them come election time. More seats means a bigger majority for your party.
Trade-offs create opportunity costs. The thing you don't choose when you make a trade-off is your opportunity cost
I think the answer would be false. Old drivers with a lot of driving experience will still be at risk for a crash if they drink a small amount and drive. Alcohol can affect someone's ability to drive regardless of age or experience.
False is choice B.