im not sure which one to answer, and i can hardly see the text.
Depends on what the base is. You would reference the base dissociation chart for that value.
Neutrons actually don't carry an electrical charge, which is why they are called neutrons because they are "Neutral".
The conclusion that would support the students prediction is B) Plant "A" grows taller than Plant "B".
If the student thinks that adding fertilizer to the plant would help it grow then answer B) would make the most sence.