Final answer:
The end and internal marks of words and sentences are collectively known as punctuation, which includes various symbols like commas and periods.
Step-by-step explanation:
The question refers to the end and internal marks of words and sentences, which are collectively known as punctuation.
Punctuation includes various symbols such as commas, periods, question marks, exclamation points, semicolons, colons, dashes, and parentheses that help clarify meaning by indicating pauses or divisions within text, or signal the end of a sentence.
The correct option, therefore, is a. punctuation. When you provide correct option in final answer, you help ensure that the student can confidently understand and use these punctuation marks in their own writing.