|Question 18Verbal

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Text
The Hereford map is a mappa mundi from the fourteenth century. Currently held at Hereford Cathedral in Hereford, England, it is one of over 1,000 such world maps from the European Middle Ages still remaining, with the even older Vercelli map from the thirteenth century (now held at the Archivio Capitolare in Vercelli, Italy) blank another one.
Which choice completes the text so that it conforms to the conventions of Standard English?
was
A
being
B
is
C
has been
D