求助 sas 220题 chapter22 的第5题

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5. What happens when the fourth iteration of the DATA step is complete?
data perm.orders (drop=type);
infile produce;
retain Fruit;
input type $1. @;
if type='F' then input @3 fruit $7.;
if type='V';
input @3 Variety : $16. @20 Price comma5.;
run;
A. All of the values in the program data vector are written to the data set as the third
observation.
B. All of the values in the program data vector are written to the data set as the fourth
observation.
C. The values for Fruit, Variety, and Price are written to the data set as the third
observation.
D. The values for Fruit, Variety, and Price are written to the data set as the fourth
observation.
为什么选C不选D？？？

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关键词：sas iteration retain