Question

   To form the plural of a noun ending in s, sh, ch, or x, you should add 

Answer 1

D. -es

Basic grammatical rule. Best way to remember those is by reading it aloud and judging it by how familiar it sounds. Example: singular pass becomes passes, arch becomes arches, fax becomes faxes, and stash becomes stashes. Of course, however, there are exceptions, but I hope this helped nonetheless.