An rna strand with sequence 5'-guacaaugacuuauguac-3' can potentially form which structure? bulge loop stem-loop multibranched junction internal loop

The most common type for this sequence of RNA strand is the stem-loop/ hairpin type. A hairpin is an unpaired loop of messenger RNA that is created when the strand folds and creates base pairs with another section from the similar strand. This is a secondary structure which is under Multibranched junction. 

Multibranched junction

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: