Write a question about the following article.

Not only that but we saw 2 dead dogs in the river - the same kind and about 50 yards apart , it was horrifying . It got dark before we could reach the take out so we stopped early next to / under a bridge on 421 . We called my mom to come pick us up on the side of the highway thinking we could make it to the bridge in 15 minutes .

Question:
Why was the narrator horrified ?
Options are: (i). Because they smelled a dead dog . (ii). Because they saw a dead body . (iii). Because it was getting dark outside . (iv). Because they saw a dead dog .