Answer :
The sentence 'I love autumn it is my favorite season.' is a fused sentence. This is because it consists of two independent clauses joined without any punctuation or coordinating conjunction.
A fused sentence, also known as a run-on sentence, occurs when two independent clauses are improperly joined without appropriate punctuation or conjunctions. In the given examples, sentence A has two separate thoughts: 'I love autumn' and 'it is my favorite season'. These can stand alone as separate sentences or be correctly joined with a comma and conjunction like 'I love autumn, for it is my favorite season' or by using a semicolon 'I love autumn; it is my favorite season'. Sentences B, C, and D are correctly constructed; they do not create run-on sentences thereby disqualifying them as examples of fused sentences.