Im drawing a steven universe themed character she is shy and her wepon is a pair of dull sizzers and her emotions control her physical form /state like if she is sad she will melt what do you think it is a mettle not a gem and its gallium

The artwork is kind of primitive. Gallium is a pretty good idea. In the early days of transistor development, it was used quite a bit. It still is in LEDs (those little red lights that are miniature light bulbs. You should look it up to see what it looks like and what it does to things like Aluminum Pop cans. Those properties alone will be enough to spark your imagination. The problem is going to be drawing your character. Subtle feelings like sadness do not look like they lend themselves to sadness.  Even a simple thing like making her pretty/not pretty is a problem.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

i think it's letter a.