Based on how they each acted in the trials, the substance that would be the most metallic is B.
Answer:

Explanation:
The equation that relates electric field strength and force that a charge experiments by it is F=qE.
Newton's 2nd Law states F=ma, which for our case will mean:

We know from accelerated motion that 
In our case the proton is released from rest, so
and we get 
Substituting, we get our final velocity equation:

For the <em>proton </em>we know that
and
. Writing in S.I. d=0.0025m, we obtain:

Answer:
hm my mom said the net force changes