Is the following sentence (a) fragment, (b) run on sentence, (c) commas splice, (d) complete sentence? Although zone-delivered pricing is a plan under which customers living outside the seller's primary trading area pay the cost of delivering their purchases to them

It's a fragment. You have a long introductory dependent clause, but no independent clause.

That is a verrrrrry long convoluted adverb clause.... therefore, a fragment.

Identify the complete adjective clause.

I elected to take astronomy, which is not a required course.

To determine if the following sentence is a fragment, run-on sentence, comma splice, or a complete sentence, we can analyze its structure.

The sentence in question is: "Although zone-delivered pricing is a plan under which customers living outside the seller's primary trading area pay the cost of delivering their purchases to them."

To assess its structure, we need to consider whether it contains a subject and a predicate. A complete sentence should have both.

In this sentence:
- The subject is "zone-delivered pricing"
- The predicate is "is a plan under which customers living outside the seller's primary trading area pay the cost of delivering their purchases to them."

Thus, based on this analysis, we can conclude that the provided sentence is a complete sentence (d).