单选题 They remained constantly attentive to their goal, as a sunflower always turns and stays focused on the sun.
【正确答案】 B
【答案解析】解析：句意：他们一直坚持着自己的目标，就像向日葵总是向着太阳转动。句中出现了比喻词“as”，把这些人比做了向日葵，因此该句是明喻，即simile，B项正确。