Answer :
The topic of the slogan "fifty-four Forty or Fight" is the acquisition of the Oregon Country.
What did James slogan fifty-four Forty or Fight mean?
His primary campaign issue was to expand the United States to include Texas and the Pacific Northwest. Hence, Polk's battle cry was "Fifty-four forty or fight" which means the United States would accept nothing less from the British than all of the Oregon Country, as far north as the border of Alaska.
Because of this, James Polk's plan was to claim the entire region and go to war over it with the British as the United States had fought them twice before in relatively recent memory.
Therefore, the Option B is correct.
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