Which one of the following programs will only find files that are in your PATH?

A.
locate

B.
slocate

C.
which

D.
find

Explanation/Reference:
From the man pages:
which  returns  the  pathnames of the files (or links) which would be executed in the current environment, had its arguments been given as commands in a strictly POSIX-conformant shell.  It does this by searching the PATH for executable files matching the names of the arguments. It does not follow symbolic links.