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which of the following is a muscle of the posterior abdomen which supports posture by performing lateral flexion of the spine?
rectus abdominus
external oblique
quadratus lumborum
internal oblique
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Explanation:

The Rectus Abdominus flexes the spine and compresses the abdomen. The External Oblique aids in trunk rotation and lateral flexion but is not a posterior - abdomen muscle. The Internal Oblique also assists in trunk rotation and lateral flexion and is not posterior. The Quadratus Lumborum is a posterior - abdomen muscle that laterally flexes the spine and supports posture.

Answer:

Quadratus Lumborum