In october 1957 the soviet union sends up sputnik i. the author writes, “there were no humans or animals on board.” why was this most likely the case? highlight text a. the satellite was too small to hold a live person or animal. b. space travel was considered too dangerous at this time to risk life. c. the united states had already sent a human and an animal into space. d. sputnik i was not equipped to support the needs of a human.