Answer:
D. Liquids
Explanation:
Liquid is probably the rarest state in the Universe, with the only discovered naturally occurring liquids being the Earth's surface water and our liquid metal core.
Answer: the answer is LIQUIDS
The Lewis acids are electron pair acceptors due to the availability of vacant orbitals they accept electrons from the donor compounds.
Hence, and are Lewis acids.
The final balanced equation is : 2C2H2+5O2→4CO2+2H2O.
C
Its eurasian plate.