The correct answer is option 'A' - The quarrel ended in a friendly way.

Explanation:
Quarrels or conflicts can have varying outcomes depending on how the individuals involved handle the situation. In this case, the quarrel ended in a friendly way, which implies that the parties managed to resolve their differences amicably and reach a peaceful resolution. Let's explore the possible scenarios:

a) The quarrel ended in a friendly way:
When a quarrel ends in a friendly way, it means that the individuals involved were able to communicate effectively, understand each other's perspectives, and find a mutually agreeable solution. This could involve apologizing, forgiving, compromising, or finding common ground. It signifies a positive outcome where the relationship between the parties is restored, and they can move forward without any lingering animosity.

b) The quarrel never ended:
If the quarrel never ended, it implies that the parties involved were unable or unwilling to resolve their differences. This could be due to a lack of effective communication, stubbornness, or an unwillingness to compromise. In such cases, the quarrel may continue indefinitely, causing further strain on the relationship and potentially escalating into a more serious conflict.

c) The quarrel continued:
If the quarrel continued, it suggests that the parties were unable to find a resolution and the conflict persisted. This could be due to ongoing disagreements, unresolved issues, or a lack of willingness to work towards a compromise. Continuation of the quarrel can lead to deterioration of the relationship and further negative consequences.

d) None of these:
This option implies that none of the above scenarios accurately describe the outcome of the quarrel. However, since option 'A' - The quarrel ended in a friendly way, is the correct answer, it suggests that the individuals involved were able to resolve their differences and reconcile in a positive manner.

In summary, option 'A' - The quarrel ended in a friendly way, indicates that the individuals involved in the quarrel were able to resolve their differences amicably and restore their relationship in a positive manner.