The correct verb phrase is 'estaré estudiando.' It matches the subject 'yo' for an action happening tomorrow afternoon.
The correct verb phrase to complete the sentence is: C. estaré estudiando en casa de Isabel.
In this case, the subject 'yo' (I) matches with the verb phrase 'estaré estudiando' (will be studying) in the future tense to indicate the speaker's action happening tomorrow afternoon.
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