Final answer:
The correct sentence is 'Están sintiéndose bien'
Step-by-step explanation:
The correct sentence that means 'They are feeling well' in Spanish is option OB. 'Están sintiéndose bien.' The verb 'sintiéndose' is the reflexive form of 'sentir,' which means 'to feel.' The adjective 'bien' means 'well.' Therefore, the sentence translates to 'They are feeling well.'
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