单项选择题

/"This line/" in Paragraph 3 refers to
A.the line from the Tower Gateway Station to Poplar.
B.the line from Poplar to Island Gardens.
C.the Millwall Extension Railway.
D.the line from Poplar to StratforD.

A.the
B.
B.the
C.
C.the
D.
D.the
E.