Bunuel
Although British and French abolitionists of the late 1700s predicted that manumission and the blockading of slave ships
would gradually undermine it, slavery continued to be the dominant cultural and economic force in southern America until the end of the American Civil War in 1865.
(A) would gradually undermine it
(B) to be a gradual undermining of it
(C) would be a gradual undermining of slavery
(D) to gradually undermine slavery
(E) gradually undermining it
(A) would gradually undermine it - (1)
a verb is needed here right after the subject to make it a dependent clause so would is correct, (2) it - the
antecedent of it is slavery and it is correct structure because it is placed right next to the noun it is modifying. We usually have it before but right after is also okay, (3) gradually -
an adverb is used correctly to modify a verb. Structure✅ Meaning✅
(B) to be a gradual undermining of it - (1) a finite verb is missing, use of the infinitive verb is not correct.
(C) would be a gradual undermining of slavery - (1) a verb is needed here right after the subject to make it a dependent clause so would is correct, (2) gradual is an adjective which can only modify a noun but here it is wrongly modifying a verb❎. Incorrect.
(D) to gradually undermine slavery - (1) a finite verb is missing. Incorrect.
(E) gradually undermining it - (1) a finite verb is missing. Incorrect.
Therefore,
option A is the correct answer.