Question

which excerpt from \how should one read a book?\ best states the authors purpose?
most commonly we come to books with blurred and divided minds, asking of fiction that it shall be true, of poetry that it shall be false, of biography that it shall be flattering, of history that it shall enforce our own prejudices.
but if you open your mind as widely as possible, then signs and hints of almost imperceptible fineness, from the hirst and turn of the first sentences, will bring you into the presence of a human being unlike any other.
thus to go from one great novelist to another—from jane austen to hardy, from peacock to trollope, from scott to meredith—is to be wrenched and uprooted, to be thrown this way and then that.
but a glance at the heterogeneous company on the shelf will show you that writers are very seldom \great artists\; far more often a book makes no claim to be a work of art at all

Explanation:

The author aims to encourage readers to approach books with an open - mind. The second option emphasizes opening the mind widely to perceive the subtleties in books, which best reflects the author's purpose.

Answer:

But if you open your mind as widely as possible, then signs and hints of almost imperceptible fineness, from the first and turn of the first sentences, will bring you into the presence of a human being unlike any other.