What could be the reason for this error?

View the Exhibit and examine the attributes of an undo tablespace. In an OLTP system, the
user SCOTT has started a query on a large table in the peak transactional hour that
performs bulk inserts. The query runs for more than 15 minutes and then SCOTT receives
the following error: ORA-01555: snapshot too old What could be the reason for this error?

A.
There is not enough space in Flash Recovery Area.

B.
There is not enough free space in the flashback archive.

C.
The query is unable to get a read-consistent image.

D.
The query is unable to place data blocks in undotablespace.