哎，别嫌我烦，这个题为什么又选A呢？

----|----10---|----20---|----30
72 95
The following SAS program is submitted:
data test;
in file 'size';
input@ 1 height 2.@ 4 weight 2;
run;
Which one of the following is the value of the variable WEIGHT in the output data
set?

A. 2
B. 72
C. 95
D. . (missing numeric value)