What is the primary effect of Denial-of-Service incidents on network resources?

In the context of Denial-of-Service (DoS) incidents, the primary effect is that they prevent authorized users from accessing resources. DoS attacks typically aim to overwhelm a network, service, or application by flooding it with excessive traffic or exploiting vulnerabilities, leading to a degradation or complete loss of service. This disruption can deny legitimate users the ability to connect and utilize the resources they need, resulting in significant downtime and potential financial loss for organizations.

The impact of a DoS attack can be far-reaching, often affecting the availability of services that businesses and users rely on, whether that's website access, email services, or any critical online resources. Thus, option B rightly identifies the main consequence of these incidents as the hindrance of authorized user access, illustrating the nature of the threat posed by DoS attacks.