I think the parent council should build the outdoor classroom. My son is in grade 3 and he loves to be outside, I think many children are same.
Today children spend too much time in front of screen. They use tablet and phone at home every day, so at school they need something different. In the outdoor classroom they can learn about plants in the garden beds and see how the weather change with the weather station. This kind of learning is more interesting and children remember it better.
Also, the outdoor classroom is for all classes in the school. Every teacher can book it and use it for different subjects, for example science, art or reading. But the laptops is only thirty and it is only for one class in the same time.
Laptops are good for learning computer skills too. But I think the school already has some computer. The outdoor classroom is something new that our school don't have.
That is why I choose option A.