Answer:
The correct answer to the question: Which revision corrects the sentence error above? is: My friends don´t understand why I love my truck; it is a 1947 Studebaker in pristine condition.
Step-by-step explanation:
The explanation comes from understanding the function of the second clause, which further expands on the information of the first, and also why it is necessary to use punctuation marks to divide the main sentence, from the clause. Since this is a main claim: "My friends don´t understand why I love my truck", and the clause after it explains why the speaker likes his truck, so that the reader also understands the point, it is necessary to make it clear that the second half of the sentence is an explanatory clause, which adds further information. In order to do this, you must use a semicolon to indicate that the second half of the main sentence wishes to expand information on the first.