b) Say who...

Решение:

• watched the tourists from the wall: Walter and Mary (Walter and Mary loved to sit on the wall and watch the tourists).
• told the legend about the ravens of the Tower: A Beefeater (Mary heard a Beefeater say once that as long as there were ravens at the Tower of London, England would stay a great country).
• was tired of the Tower and the people: Anne and William (Anne and William, two of the other ravens that lived in the Tower, came and said, "I had a terrible day. I'm tired of this place and noisy tourists.").
• had a bad day in the Tower: Anne and William (This is implied by their statement about being tired of the place and noisy tourists).