I need a lot help with this pls!):
Just write and I will give my answer in a video.

Konoe Ayatsuki Mercury (コノエ＝アヤツキ＝マーキュリー Konoe Ayatsuki Mākyurī), more commonly known as Nine (ナイン Nain) She is a playable character in BlazBlue: Centralfiction known as Nine the Phantom (ナイン＝ザ＝ファントム Nain za Fantomu)

Explanation:

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.