A first-order reaction, A → products, has a half life of 75 s, from which we can draw two conclusions. Which of the following are those two? 

(a) The reaction goes to completion in 150 s; 

(b) The quantity of A remaining after 150 s is half of what remains after 75 s; 

(c) The same quantity of A is consumed for every 75 s of the reaction; 

(d) One-quarter of the original quantity of A is consumed in the first 37.5 s of the reaction; 

(e) Twice as much A is consumed in 75 s when the initial amount of A is doubled; 

(f) The amount of A consumed in 150 s is twice as much as is consumed in 75 s.