Choose the sentence that contains the grammatical error of a fragment, a comma splice, or a fused sentence.
1)
The fad to own a lake home has declined, many people simply cannot afford
two homes.
2) Since revenues are down, the company has reduced its number of employees.
3) The company was destroyed by fire, and arson is still strongly suspected.
4) He wrote a letter of complaint to the company, but they never responded to
him.