The answer is B) It suggest a tone of worry. The reason is because the phrase "knitting their cheeks" means the that the llamas were moving their jaws. This along with the fact that they were contemplating the writer suggests that the llamas are unsure of the writer.
The second choice is the answer.
Unrealistic and impractical
Explanation:
every summer my friends and I play in a five-a-side football tournament there are lots of people who want to play and it can difficult to squeeze everybody in