Response:
That is indeed favorable.
Clarification:
c) “Men work together... whether they work together or apart.” (“The Tuft of Flowers,” Robert Frost)
The Fugitive Slave Act is the event that I believe prompted Stowe to write Uncle Tom’s Cabin.
In this sentence, there exists a single adverb, which is the term increasingly.
Adverbs function to modify verbs or adjectives, and here, the word increasingly modifies the adjective ineffective.
No other adverbs are present in the sentence, making increasingly the only valid choice.
