I think its c because solid,liquid nor plasma really fits to the description and i don't really know the last one so the best option is probably C.
Answer:
Chlorine is a very reactive non metals because this element don't form any known chemical compound.
Explanation:
Chlorine atoms have a lot of valance electrons without being complete on its own, so it has a greater need to seek it's conjugates. That's called electronegativity. Halogens are highly reactive because of their electronegativity.
A hypothesis is a prediction of what you believe to be true.
When air pressure is low it is Cold
