Both authors mention cleaning the ocean, but the author in "The Human Behavior Solution" believes that-

Read this sentence: while on vacation, i often relax by reading one of myfavorite books, go to the movies, or swimming in the pool.which revision corrects the parallel structure error? a. while on vacation, i often relax by reading one of my favoritebooks, going to the movies, or swimming in the pool.ob. while on vacation, i often relax by reading one of my favoritebooks, going to the movies, or swim in the pool.oc. while on vacation, i often relax by reading one of my favoritebooks, i like to go to the movies, or go swimming in the pool.od. while on vacation, i often enjoy relaxing by reading one of myfavorite books, go to the movies, or swimming in the pool.