Directions: The sentence below has been divided into four parts. One of the parts may have an error of grammar or diction. Select the part having the error. If there is no error, choose option (e).

(a) The functions of the Earth - to give life to the plants and animals, (b) regulate the rainwater, purify waste and (c) to return it to the soil -- may be said (d) to form the main artery of Nature's cyclical function (e) No error