Review: Identifying Punctuation Errors, Answer 1.2

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Question:

I wrote letters to: my aunt, the cable company, and my close friend Joe who moved to Tofino four years ago.

Answer:

The answer incorrect is correct.

Explanation:

You should have punctuated the sentence as follows:

Answer:

I wrote letters to my aunt, the cable company, and my close friend Joe, who moved to Tofino four years ago.

Never use a colon between a preposition and its objects. The comma after company is optional, but the comma after Joe is needed because the material that follows is non-restrictive.