Why is dalton credited with proposing the first atomic theory if democritus was talking about atoms almost 2,200 years earlier?

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.

U whay do you need with?

Depends on the speed of the car.

B. nuclear reactions could first occur.