Ans: B
employees is countable: One employee, two employees, three employees; therefore, the number of should be included in the answer.
This eliminates: A,C,E
Also-don't know if this is correct but
Weston insurance has hired thus the result of this hiring is usually followed by a verb with an -ing ending.
B/D: The split is between
in the claims dept and
of the claims dept...in the claims dept is correct because in the claims dept is correctly used
After adopting broadband internet access, wireless personal digital assistants, and super-fast home PCs, Weston Insurance has hired new employees,
which doubles to 250 the junior staff in the claims department working from home.(A) which doubles to 250 the junior staff in the claims department
(B) doubling to 250 the number of junior staff members in the claims department
(C) which doubles to 250 the junior staff of the claims department
(D) doubling to 250 the number of junior staff members of the claims department
(E) which doubles to 250 the junior staff in the claims department that