一道SAS ADV 题

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请教各位大侠，下面这题的答案为什么不是D?

The following SAS program is submitted:

data towns;

input City $ pop year;

cards;

ANDOVER 75000 1998

CARY    80000 1998

ANDOVER 14000 1977

CARY    71000 1986

;

%macro a(location);

data a;

set towns;

%if &location=UK %then %do;

where city='ANDOVER';

%end;

%if &location=NC %then %do;

where city='CARY';

%end;

if pop>70000;

run;

%mend;

%a(UK)

Which one of the following represents the resulting output in the SAS data set A?A. 1 observation with the value of CARY for the variable City

B. 2 observations with the value of CARY for the variable City

C. 1 observation with the value of ANDOVER for the variable City

D. 2 observations with the value of ANDOVER for the variable City
Correct answer: C

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关键词：observations observation represents following represent represents following where 14000

是不是少看了一句
if pop>70000;

后面还有个if pop>70000

Haha, you are right, many thanks!