Final answer:
The responsibility for using "s" to pluralize most nouns lies with the speakers and writers of the English language.
Step-by-step explanation:
In the English language, the responsibility for using "s" to pluralize most nouns lies with the speakers and writers of the language. It is a grammatical rule that has been developed and followed over time. The decision to add an "s" to make a noun plural is based on the context and rules of English grammar.