Sentence Correction (SC) | Re: The average individuals cost of going into space is estimated at a

HiDmitryFarber VeritasKarishma can you please help me one doubt in option E , i rejected it because -> It is estimated that by the end of the 21st century the cost to the average individual of going into space will be a fraction of the current price per economy ticket of transatlantic airplane travel. This cost to average individual strike me , (what is average individual , shouldn't it be average cost to individual. ) so I chose C.Is this "average individual" correct here?

FOr those who saying estimated at is incorrect , below is GmatPrep question With surface temperatures estimatedat minus 230 degrees Farenheit, Jupiter's moon Europa has long been considered far too cold to support life, and with 60 square miles of water though to be frozen from top tobottom.