37. The SAS data set ONE contains fifty million observations and contains the variables PRICE, QUANTITY,
FIXED, and VARIABLE.
Which SAS program successfully creates three new variables TOTREV, TOTCOST, and PROFIT and requires the
least amount of CPU resources to be processed?
A.data two;
set one;totrev = sum(price * quantity);totcost = sum(fixed,variable);
if totrev > 1000;
profit = sum(totrev,-totcost);
run;
B.data two;
set one;
totrev = sum(price * quantity);
if totrev > 1000;
totcost = sum(fixed,variable);
profit = sum(totrev,-totcost);
run;

C.data two;
set one;
totrev = sum(price * quantity);
where totrev > 1000;
totcost = sum(fixed,variable);
profit = sum(totrev,-totcost);
run;

D.data two;
set one;
where totrev > 1000;
totrev = sum(price * quantity);
totcost = sum(fixed,variable);
profit = sum(totrev,-totcost);
run;

Answer: B
为什么是B 不是C啊