"It'll be a long time before I'm happy again." This statement reflects a sense of hopelessness, which can be a common reaction to grief but does not specifically indicate clinical depression. It's important for individuals to express their feelings during the grieving process.

"I don't know how I could cope if I didn't have my family's support." This statement reflects a dependency on family support to cope with grief, which is a common reaction. While it's important to consider the impact of support systems, this statement doesn't directly indicate clinical depression.

"I don't feel anything but numbness anymore." This statement is indicative of clinical depression. Numbness, or emotional blunting, is a hallmark symptom of depression. It goes beyond the normal grief experience and suggests a deeper emotional disturbance.

"I feel like I'm angry at the whole world right now." While irritability and anger can be components of both grief and depression, this statement is not as specific to clinical depression as the numbness described in choice C.