Final answer:
The sentence in question, "It is raining, so you need to wear a jacket," is a compound sentence because it has two independent clauses joined by the coordinating conjunction 'so'. Option b) Compound is the correct answer.
Step-by-step explanation:
The sentence "It is raining, so you need to wear a jacket" is a type of sentence based on the number and types of clauses it contains. This sentence comprises two main clauses connected by a coordinating conjunction ('so'). These two clauses are 'It is raining' and 'you need to wear a jacket.'
Both parts have a subject and a predicate and could stand alone as separate sentences; hence, this structure forms a compound sentence. A compound sentence is characterized by at least two independent clauses joined by a coordinating conjunction such as for, and, nor, but, or, yet, so (FANBOYS).