The members of the chess club B. Are practicing for their next match.
The difference between singular and plural nouns is that while a singular noun is used to identify one individual, place, thought or object, a plural noun is used to identify more than one individual, place, thought or object.
Some primary rules to identify them are:
1. Almost every regular plural noun contains an -s at the end.
2. Regular nouns that end in -ch, -s, -ss, -sh, -x, -z contain an -es at the end. E.g: cross/crosses.
In this case, the noun members, contains an -s at the end (member is the singular form).