Of the 2 figures, which is the correct structure of RNA,
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As Marzipanherz said, RNA does not contain thymine. Furthermore, none of those resemble any kind of RNA structure you usually see, for example two dimensional secondary structures showing watson-crick basepairing such as this example: http://www.rna-seqblog.com/wp-content/uploads/2014/02/secondary1.jpg
Familiarize yourself with RNA by e.g. reading the wikipedia article or something https://en.wikipedia.org/wiki/RNA After you've done this, you can e.g. go to the vienna webserver http://rna.tbi.univie.ac.at/cgi-bin/RNAWebSuite/RNAfold.cgi and predict secondary structures of your own RNA sequences.