For the first one- B. Magma (I don't think there is a need to explain this..)
Second question- C. ability to burn A physical property doesn't change a material's actual composition, just the way it looks, and/or it can be measured without changing a material's chemical composition. Melting point, hardness, and density apply to this, while the ability to burn does not.
The biggest difference between the two is that fantasy takes place in a world other than our own, whereas magical realism focuses on ordinary people going about their ordinary lives in an ordinary world. Magical realism is intentionally vague; people don't know why or how the magic works, it just does
Most likely, Mayra will develop heart-related problems when she grows older. Most heart problems, especially high blood-pressure, are hereditary, meaning that she will most likely develop a form of these problems at some point in her life. She is also much more likely to have a heart attack in her life.