Answer:
2. That's the other thing I learned: being active is just as important as eating better foods.
3. Over the years, many of us have read the words of Henry B. Adams: “A teacher affects eternity; she can never tell where her influence stops.”
Explanation:
Colons can introduce an item or a series of items when it is preceded by a complete thought like in <u>option 2</u>, where the semicolon introduces an idea and is preceded by “That's the other thing I learned,” which is a clause expressing a complete thought.
Colons are also used to introduce quotations, such as in <u>option 3</u>, where it introduces the quote “A teacher affects eternity; she can never tell where her influence stops.”
The other punctuation found in option 3 are also correctly placed: commas are to be placed after Introductory Phrases like “Over the years,” quotation marks are used to enclose quotes like “A teacher affects eternity; she can never tell where her influence stops;” semicolons link two independent clauses closely related but that are not linked with a conjunction, such as it links the two clauses within the quote and lastly, the period is also correctly placed because when a quotation ends a sentence, the period is placed before the final quotation mark.