Hi! This sentence has an underlined part that is grammatically incorrect. There are four options provided, and I don’t understand why option D is the best choice. The explanation says it’s about the use of “before,” but in that case, I don’t see why option A doesn’t work too, they seem to have the same structure to me. 🥺😫
"Before writing a book,....."
(My initial answer was C 🤣)