Question

One or more adjacent sectors form a(n) track, the smallest amount of disk space that can be used to hold a file. _________________________

Answer 1

Your teacher is probably looking for a block or sector (they're synonymous). Links can be held in the metadata in the directory file, and link is one of the seven types of files, so to be pedantic, the directory entry would be the smallest amount of disk space that a file can use.

That ought to get your teacher revved up!