La oracion pretende: eucerin crema antiestrias un aumento del 28,4%en la elasticidad y firmeza de la piel A) mostrar los resultados de un estudio clinico B) presenta una opinion objetiva para su aceptacion general C) respalda a traves de datos comprobables la eficacia del producto D) ninguna de las anteriores.

C) respalda a traves de datos comprobables la eficacia del producto

Explanation:

The underlined part is "28,4%en la elasticidad y firmeza de la piel" or "a 28.4% increase in elasticity and  firmness of the skin".

In the context, the sentence is talking about a anti stretch cream called as EUCERIN ANTI-STRETCH CREAM. It says that if women use the cream for about eight weeks, they will get a good skin tolerance and it is clinically proven that there is increase in elasticity and firmness of the skin by about 28.4% after using this anti-stretch cream.

Thus this shows the effectiveness of the cream and they have also provided a verifiable data along with it which is verified and proven in chemical testing of the cream.

in his book, the riddle of the rosetta stone, james giblin talks about how there was a young british polymath and physician named thomas young who made a lot of advances on the deciphering of the rosetta stone. he says that even though young made a lot of mistakes because he was working under false assumptions, he also made huge contributions like deciphering three out of the seven symbols (more than anyone else before him). young published his findings and continued his good work but he wasn't able to progress much further due to some unfavorable situations, he still laid the basis for many other scholars and of course for the man who has been generally known to have deciphered it, jean-françois champollion

i think it was   tsar alexander ii