Your question should be 'Why is this one correct?'. If you're hoping to take IELTS, you need to pay attention to basic grammar...
As for the answers, I agree with James.
1. This is pure nitpicking - I don't think there's anything wrong with 'shows'.
2. This is correct. You give, supply or provide information, but you can't indicate information. Indicate means 'points to', so you could, for example, say 'These graphs indicate a trend'.