In this excerpt from the passage provided, which letter designates a word that could be replaced by difficult without changing the meaning of the sentence it is in?
In kindergarten, or even before, we come to understand the meaning of words on a page and how they are (A) significant. As children grow up, however, many fail to foster a love of or appreciation for reading, instead (B) labeling it as a schooltime activity or a source of stress. Reading comes to be regarded as (C) harrowing or tedious, and for many, it is only engaged in for the purpose of (D) receiving a passing grade.