Final answer:
The correct sentence is option B: Monet's painting looked so real from a distance.
Step-by-step explanation:
The correct sentence is option B: Monet's painting looked so real from a distance. The sentence correctly uses the possessive form of Monet's name and does not require any punctuation between 'painting' and 'looked'. Additionally, 'from a distance' is a prepositional phrase that describes where the painting looked real.
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