What is the value of the TOTALPASSENGERS variable in the output data set?

The following SAS program is submitted:

data work.passengers;

if OrigPassengers = . then’

OrigPassengers = 100;

TransPassengers = 100;

OrigPassengers = .;

TotalPassengers = sum (OrigPassengers, TransPassengers) +0;

run;

What is the value of the TOTALPASSENGERS variable in the output data set?
A . 0
B . 100
C . 200
D . (missing numeric value)

Answer: B

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