**Core Concept**
Actin filaments in skeletal muscle are anchored to the Z-disks (also known as Z-lines) through a complex of proteins that provides structural support and maintains muscle contraction. The binding of actin to the Z-disk is crucial for the regulation of muscle contraction and relaxation.

**Why the Correct Answer is Right**
The correct answer involves the protein Alpha-actinin, which is a key component of the Z-disk. Alpha-actinin binds to the actin filaments and cross-links them to the Z-disk, providing a mechanical link between the actin filaments and the Z-disk. This binding is essential for the proper functioning of the muscle contraction apparatus.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely an incomplete or incorrect answer. Without more information, it's difficult to determine why this option is incorrect.

**Option B:** This option may be a distractor related to the binding of actin to tropomyosin, which is a protein that wraps around the actin filament and regulates muscle contraction. However, this is not the correct answer, as tropomyosin is not directly responsible for binding actin to the Z-disk.

**Option C:** This option may be a distractor related to the binding of actin to myosin, which is a protein that interacts with actin to produce muscle contraction. However, this is not the correct answer, as actin is not directly bound to myosin at the Z-disk.

**Clinical Pearl / High-Yield Fact**
The Z-disk is a critical structure in skeletal muscle that provides a mechanical link between the actin filaments and the sarcolemma (muscle cell membrane). Disruptions to the Z-disk, such as those seen in muscular dystrophy, can lead to muscle weakness and degeneration.

**Correct Answer: D. Alpha-actinin**