please explain this exercise to me

[tinh.co]

i do multiple-choice, i think please + v that's true but the key is please to v. i'll post that question
question 149: we need one new computer, model ABG 493, with a medium-sized, flat- screen monitor. Please....two speakers.
(A) include
(B)included
(C)to include
(D)will include
key: C
i dont know this key is C. who can explain for me?
thank for advance

[bhaisahab]

i do multiple-choice, i think please + v that's true but the key is please to v. i'll post that question
question 149: we need one new computer, model ABG 493, with a medium-sized, flat- screen monitor. Please....two speakers.
(A) include
(B)included
(C)to include
(D)will include
key: C
i dont know this key is C. who can explain for me?
thank for advance

(C) is incorrect.