OE
Fewer and fewer people are learning to write (or read) cursive, and it may become true that no one will learn it in the future. If that’s the case, no one will be able to read the documents written in cursive, rendering them unreadable. The two most closely matched answers are “unintelligible” and “indecipherable.” “Intellectual” does not fit the required meaning. “Meaningless” is a tempting answer, but the documents do have meaning—it’s just that no one will be able to determine what that meaning is. “Humdrum” and “quotidian” have similar meanings, but there’s no indication that the sources will be boring, so these answers are also incorrect.
Answer: A,F