Choose the correct letter, A, B or C. What happened in 2009 in the UK?

Good morning everyone, and welcome to our weekly series on home improvements. Today’s programme is about Do-It-Yourself house painting... There’s never been a better time for people who like to do their own interior house painting. Although people still lead very busy lives, thanks to the availability of various new DIY materials, you can now decorate your home in a more efficient and a more environmentally-friendly way.
In two thousand and nine alone, approximately fifty-three million litres of the paint that was sold in the UK were left untouched — that’s enough to fill twenty-one Olympic-sized swimming pools. It’s easy to overestimate how much paint you’ll need to decorate your room if you use guesswork. And if you know exactly how much paint is needed, you avoid unnecessary waste. There are automatic paint calculators available now — most of the major paint manufacturers provide them — look on their websites, or just google ’paint calculator’ and see what comes up. Then simply measure the circumference and height of the room in metres, enter this into the calculator along with the type of surface you’re painting, and it will tell you how many litres of paint you’ll need.
But if you do end up with leftover paint, you can donate it to an organisation like Community RePaint. They will take the paint from you and redistribute it to local charities and voluntary organisations, so it goes to a good home. You can find more information about Community RePaint on communityrepaint — all one word — dot org dot uk.