Which one of the following statements completes the above and resolves title1 to "For research&development"?

The following SAS program is submitted:

<insert statement here>;

%let development = ontime;

proc print data = sasuser.highway;

title "For &dept";

title2 "This project was completed &development";

run;

Which one of the following statements completes the above and resolves title1 to "For research&development"?
A . %let dept = %str(research&development);
B . %let dept = %str(research%&development);
C . %let dept = %nrstr(research&development);
D . %let dept = %nrstr(research%&development);