The correct option is E never find their way home
The correct answer for this would be option E, i.e., without the glowworms, the mowers would never be able find their way home. This is further supported by the speaker addressing the mowers to be wandering, and the last line in the poem stating that he would be unable to find his home. It's the glowworms that show him the way and lead him straight. The statements of options A,B,C,D and E are not supported by the poem, and thus, are incorrect.