What belief of Sancho's is implied in this excerpt?

Read the excerpt from Letters of the Late Ignatius Sancho

An African

My chief pleasure has been books-Philanthropy I adore -

How very much, good Sir, am I (amongst millions) indebted

to you for the character of your amiable uncle Tobyl

declare, I would walk ten miles in the dog-days, to shake

hands with the honest corporal

O Uncle Toby has freed millions of enslaved people

Uncle Toby has taught him how to read

O Uncle Toby is a very talented writer

O Uncle Toby is a remarkable creation

Uncle Toby is a remarkable creation

Explanation:

In the excerpt from "Letters of the Late Ignatius Sancho , An African," Ignatius tells writer Lawrence Sterne about his passion for literature, and thanks him for the character that Sterne created, Uncle Toby, who was inspired in the Sterne's father.

In fact, after becoming an orphan, Ignatius was taken to England, where he met the Duke of Montagu after running way from a family in Greenwich. At the Duke's house, he was encouraged to read and became known in the literary society of the time.

the answer is:

apprehensive.