A... band contains actin and is called ...B... band, whereas the ...C... band called ...D... band contains myosin.
Choose the correct options for A, B, C and D to complete the given statement :-

Options

A. A–Light, B–I, C–dark, D–A
B. A–Dark, B–I, C–light, D–A
C. A–Dark, B–A, C–light, D–I
D. A–Light, B–A, C–dark, D–I

Answer

To complete the given statement, we need to identify the correct terms that correspond to the bands containing actin and myosin in muscle fibers.

1. **Identify the band containing actin**:
- The band that contains actin is known as the **I band**.
- The **I band** is also referred to as the **light band** because it appears lighter under a microscope.

2. **Identify the band containing myosin**:
- The band that contains myosin is known as the **A band**.
- The **A band** is also referred to as the **dark band** because it appears darker under a microscope.

3. **Fill in the blanks**:
- For A, we have "light".
- For B, we have "I band".
- For C, we have "dark".
- For D, we have "A band".

Thus, the completed statement is:
"A light band contains actin and is called I band, whereas the dark band called A band contains myosin."

### Final Answer:
A = light
B = I band
C = dark
D = A band