A feasibility study technically does help with the development of the information system just as much as a prototype does. Anyway, we're not debating about the wording. Just look at the diagram. The only thing that looks to me to be anything like a prototype is the first box. The rest indicates that it's a feasibility study.
In a feasibility study you "evaluate the system" and then make a decision on whether you "abandom the system", "revise the system" or whether the "system is complete". A prototype just allows you to demostrate the current system through participant input and better understand the nature of the problem. Of the answers in the question, C is the most suitable.
On another note, I always get these errors while trying to view just about any thread in the forum/trying to reply. So If I don't reply you now know why
Warning: Can't create UNIX socket (55) in /usr/home/www/sites/hsc.ozlpn.com/htdocs/community/admin/db_mysql.php on line 40
Warning: MySQL Connection Failed: Can't create UNIX socket (55) in /usr/home/www/sites/hsc.ozlpn.com/htdocs/community/admin/db_mysql.php on line 40