Base SAS 50

A raw data file is listed below:
--------10-------20-------30
1901 2
1905 1
1910 6
1925 .
1941 1
The following SAS program is submitted and references the raw data file above:
data coins;
infile 'file-specification';
input year quantity;

run;
Which one of the following completes the program and produces a non-missing value for the variable TOTQUANTITY in the last
observation of the output data set?
A. totquantity + quantity;
B. totquantity = sum(totquantity + quantity);
C. totquantity 0;
sum totquantity;
D. retain totquantity 0;
totquantity = totquantity + quantity;
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