Question #N1310

The world’s largest collection of Shakespearean artifacts, the Folger Shakespeare Library, _____ to the public since 1932, attracting thousands of visitors each year. It houses over 80,000 books and manuscripts, as well as rare first editions of Shakespeare’s plays.

Which choice completes the text so that it conforms to the conventions of Standard English?
A. has been open
B. is open
C. was open
D. opened