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The volume of a sphere is calculated using the formula V = (4/3)πr^3, where r is the radius of the sphere. Since the diameter is 2 feet, the radius is 1 foot.
Plugging in the values, we get V = (4/3)π(1)^3 = (4/3)π = 4.188 ft^3.
Rounding to the tenth, the volume is approximately 4.2 ft^3. Therefore, the answer is A. 4.2 ft^3.