SAT Question 0f2933b9: Text Structure And Purpose answer and explanation

English - Text Structure And Purpose - Function Of Underlined Portion
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The following text is from William Shakespeare’s circa 1611 play The Winter’s Tale. Camillo has been away from his home in Sicily and serves in the court of Polixenes, the king of Bohemia. He has asked Polixenes for permission to return to Sicily. POLIXENES: I pray thee, good Camillo, be no more importunate. ’Tis a sickness denying thee anything, a death to grant this. CAMILLO: It is fifteen years since I saw my country. Though I have for the most part been aired abroad, I desire to lay my bones there. Besides, the penitent king, my master, hath sent for me, to whose feeling sorrows I might be some allay—or I o’erween [presume] to think so—which is another spur to my departure.
8
Difficulty:Hard
Which choice best describes the function of the underlined portion in the text as a whole?