Gravitational force is very weaker;
Leaning against a brick wall.
All the others use scientific forces of work.
-Steel jelly.
Answer:
Less than a quarter of Earth's surfaces are dry, ice free lands
I believe the answer is c but I’m not 100% sure
relation between potential difference and electric field is given as

so here we know that
d = 3 cm



So now when plates are separated to 4 cm distance carefully
the potential difference between them will change but the electric field between them will remain constant
So at distance of 4 cm also the electric field will be E = 1000 N/C