25) E

The question does not state how many chocolate bars Nicola has bought and whether she has bought different types of chocolate bars.

Statement 1: Incorrect
This is not necessarily true. She could have bought 8 Venus bars at 30p each which would have brought the total to £2.40

Statement 2: Incorrect
Not necessarily. Again, she could have bought 8 Venus bars at 30p each which would have brought the total to £2.40

Statement 3: Incorrect
Not necessarily. Again, she could have bought 8 Venus bars at 30p each which would have brought the total to £2.40. This means she could have 8 bars altogether.

Statement 4: Incorrect
This is a bit tricky. Let us assume she bought one of each. This would cost her: 30p + 40p + 50p = £1.20. This is exactly half of £2.40
If she had bought two of each, this would bring her total to £2.40
So, she can have an equal number of each of the bars.