"Options Indexes" is only used when none of the files listed in the "DirectoryIndex" exist. In other words, as long as there is a file named either "index.htm", "index.html", "index.php", "index.shtml", "index.cgi", "index.pl", or "index.xhtml", that file should be displayed.
Does one of those files exist in the directory in question? Is the file named properly (e.g., no spaces in the name, all lower case, etc.)?
Or are you looking to have apache actually generate a listing of the files in that directory? If so, then the "Options Indexes" directive would be needed.