What type of molecules will create a solution when mixed with water

The correct answer as to the type of molecules that will create a solution when mixed in water would be polar molecules.

One end of polar molecules is slightly positive while the other end is slightly negative. These molecules are attracted by the molecules of water through the opposing ends. Water molecules are also polar due to the hydrogen bonds between the molecules.  

The kind of attraction in this case is known as dipole-dipole attraction, and thus, leads to the dissolution of the molecules and a solution results.

More on polar molecules can be found here:

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