We are not experts on automobile safety. Perhaps try over at Health, but all in all I don't understand the point of this question. What is a baloon? If it has to do with breasts then I don't understand its relation to the spinal cord. In turn, why would safety belts be dangerous for your spinal cord? Lastly and obviously the correct answer is 'C' as indeed in a frontal car crash your breasts will become seriously injured when putting the belt as in A, while in B the belt's going to cut into your chest. It should be fitted with the broad site towards you, again quite obviously.
To be honest, I thought the linked question was to troll around. Was it?