To speak habitually of the "truly needy" is gradually instilling the notion that many of those who are just called "needy" actually have adequate resources; such a conclusion is unwarranted.
(A) To speak habitually of the "truly needy" is gradually instilling the notion
(B) To speak habitually of the "truly needy" is instilling the notion gradually
(C) To speak habitually of the "truly needy" is gradually to instill the notion
(D) Speaking habitually of the "truly needy" is to instill the gradual notion
(E) Speaking habitually of the "truly needy" is instilling the gradual notion

the OA is C, first of all why NOT op A is correct??? Can anyone elaborate the use of "To speak" and "speaking" in this question????