Answer: "Neither Jennifer, Thomas, nor I had ever seen the likes of that giant cheeseburger" is a simple sentence.
Explanation: A simple sentence is a sentence type that includes a single clause. In other words, a simple sentence presents only one subject and only one verb. Moreover, this sentence type does not contain dependent clauses. <u>Although the sentence provided includes three subjects joined by "neither...nor", it only has one verb ("had seen").</u> In that way<u>, "Neither Jennifer, Thomas, nor I had ever seen the likes of that giant cheeseburger"</u> is a simple sentence because<u> it expresses a complete thought</u> using only one verb.
This is a simple sentence because it features only one predication, that is, it consists of a single clause. Compound and complex would require multiple independent or subordinate clauses connected.