Took a short walk at the lake afterwards ( it was unbearably hot , so I only did 2/3 of the walk ) . Went home , took another shower and changed to go see the Army Field Band play at St. John 's . They were superb as always .

Question: Why did the writer take a shower ?
Answer: Because they went to a lake .None of the above choices .Because they only did 2/3 of the walk .Because they wanted to wash off after the exercise .