Hii:) the last 2 paragraphs are confusing, I thought mass doesn’t change?

It's true that mass doesn't change

but because of difference in gravitational force on earth and moon, the scale used for weighing weight gives different reading. If we use the scale used for measuring the mass then the reading will be same. I think this was confusing you

the answer is a)

mark brainliest

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.