Final Answer:
The rectus abdominis muscle is responsible for flexing the vertebral column and providing stability to the pelvis and lower back. Therefore, the correct answer is option b) Rectus abdominis.
Step-by-step explanation:
The rectus abdominis is a paired muscle that runs vertically along the anterior wall of the abdomen. It is commonly known as the "six-pack" muscle.
The linea alba is a fibrous band of connective tissue that runs along the midline of the abdomen, dividing the rectus abdominis into left and right halves. This separation is particularly noticeable in individuals with well-defined abdominal muscles.
The rectus abdominis is responsible for flexing the vertebral column, and its division by the linea alba contributes to the overall structure and appearance of the abdominal muscles. Understanding anatomical structures like the linea alba is crucial for healthcare professionals, athletes, and anyone interested in anatomy and fitness.
Therefore, the correct answer is option b) Rectus abdominis.