**Core Concept**
Myobacterial infections can be caused by various species, but some are more commonly associated with specific types of infections, such as abscesses. In this case, the question focuses on mycobacteria that can cause injection abscesses due to contaminated vaccines.

**Why the Correct Answer is Right**
Mycobacterium chelonae is a rapidly growing, non-tuberculous mycobacterium that can cause a variety of infections, including abscesses. These bacteria can contaminate vaccines and medical devices, leading to infections in humans. M. chelonae is known to produce biofilms, which contribute to its ability to cause persistent and severe infections. The bacteria's rapid growth rate and ability to form biofilms make it a significant concern in medical settings.

**Why Each Wrong Option is Incorrect**
**Option A:** M. kansasii is a slow-growing, non-tuberculous mycobacterium that typically causes pulmonary infections, not abscesses due to contaminated vaccines.

**Option B:** M. ulcerans is a mycobacterium that causes Buruli ulcer, a skin and soft tissue infection, but it is not commonly associated with injection abscesses due to contaminated vaccines.

**Option D:** M. smegmatis is a rapidly growing, non-tuberculous mycobacterium that is often used in laboratory settings as a model organism, but it is not typically associated with causing abscesses due to contaminated vaccines.

**Clinical Pearl / High-Yield Fact**
Mycobacteria like M. chelonae can contaminate various medical devices and vaccines, highlighting the importance of proper sterilization and quality control measures in medical settings to prevent such infections.

**✓ Correct Answer:** C. M. chelonae