Here's why:

• Nepotism: This word refers to the practice of favoring family members, friends, or associates for jobs, promotions, or other benefits, regardless of their qualifications.
• Favouritism: This word signifies the act of showing preference or giving unfair advantages to a particular person or group, often based on personal connections or biases.

Both "nepotism" and "favouritism" share the core meaning of giving preferential treatment based on personal connections rather than merit or objective criteria.

The other options don't have the same meaning as "nepotism":

• Inefficiency: This refers to the lack of effectiveness or ability to do something well, which is not directly related to the concept of giving preferential treatment.
• Carelessness: This means a lack of attention or caution, which doesn't necessarily involve favoring someone or a group.
• Corruption: While corruption can involve nepotism, it has a broader meaning that encompasses various dishonest or fraudulent practices, not just favoritism based on personal connections.