Which is the best example of parallel structure in the following sentence? paul enjoyed his grandma keep her yard neat by mowing the grass, trimming the hedges monthly, and to always haul away the debris. paul enjoyed his grandma keeping her yard neat by mowing the grass, trimming the hedges, and hauling away the debris. paul enjoyed his grandma keep her yard neat by mowing the grass, trimming the hedges, and hauling away the debris. paul enjoyed his grandma to keep her yard neat by mowing the grass, trimming the hedges, and to always haul away the debris. leave it as is.