Answer:

The correct punctuation for the given sentence is: "He neither smiled, spoke, nor looked at me." Let's understand the reasons behind this choice by analyzing the sentence structure and the rules of punctuation.

Sentence Structure:
The sentence in question is a compound sentence that includes three parallel actions: smiled, spoke, and looked at me. These actions are connected by the coordinating conjunction "nor" which indicates a negative correlation between them.

Rules of Punctuation:
1. Commas: Commas are used to separate items in a list or to separate independent clauses in a compound sentence.
2. Parallelism: Parallelism is the use of similar grammatical structures in a sentence to express equal or related ideas. When listing multiple items or actions, parallelism should be maintained.

Explanation:
Let's break down the sentence and apply the appropriate punctuation:

Original Sentence: He neither smiled spoke nor looked at me.

1. Smiled, Spoke, Looked at me: These are three parallel actions that should be separated by commas to indicate a list. However, in the original sentence, there are no commas between them.

2. Coordinating Conjunction: The coordinating conjunction "nor" is used to connect the parallel actions. However, in the original sentence, there are no commas before or after "nor."

3. Commas for Clarity: Commas are necessary to improve the clarity and readability of the sentence. They help to separate the actions and make the sentence easier to understand.

Applying the rules of punctuation, the corrected sentence becomes: "He neither smiled, spoke, nor looked at me." This revised sentence clearly presents the parallel actions with the appropriate use of commas and the coordinating conjunction "nor."

Revised Sentence: He neither smiled, spoke, nor looked at me.

By following the rules of punctuation and maintaining parallelism, the revised sentence becomes grammatically correct and effectively conveys the intended meaning.