The correct answer is option 'B': "Let tigers beware".

Explanation:
The given question is related to an incident involving a king and an astrologer's prediction. Let's analyze the situation and understand the context in which the king uttered the statement.

1. The Astrologer's Prediction:
The astrologer predicted that the king's favorite tigress would die within a week. This prediction created a sense of fear and concern in the king's mind, as the tigress held a special place in his heart.

2. The King's Reaction:
Upon hearing the astrologer's prediction, the king was deeply troubled. He didn't want any harm to come to his beloved tigress and was determined to protect her. The king then uttered the statement in question.

3. Meaning of the Utterance:
The statement "Let tigers beware" signifies the king's concern and warning to other tigers, implying that they should be cautious and vigilant. It implies that the king wants all the tigers in his kingdom to be careful and avoid any dangers that may threaten their lives, just like he wants to protect his favorite tigress.

4. Significance of the Utterance:
The king's utterance reflects his empathy towards the tigers under his rule. He is not only concerned about his favorite tigress but also about the well-being of all the tigers in his kingdom. By warning them to be aware and cautious, the king shows his sense of responsibility as a ruler.

5. Symbolic Meaning:
The statement can also be seen as symbolic, representing the king's desire to protect and ensure the safety of his subjects. Tigers are often associated with power and strength, and by warning them to be careful, the king indirectly extends this warning to all his subjects, reminding them to be vigilant and protect themselves from any potential harm.

In conclusion, the king's utterance "Let tigers beware" signifies his concern for the safety of the tigers in his kingdom and his determination to protect them. It reflects his empathy and sense of responsibility as a ruler.