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Viscoelastic tissues (muscle, fascia) exhibit time-dependent deformation under constant load—creep—allowing gradual length change with sustained, low-force stretch. Option C describes this property and supports technique rationales for gentle, prolonged holds used in myofascial or stretching approaches. Anisotropy (A) refers to direction-dependent mechanical behavior but not specifically time-dependent lengthening. Thixotropy (B) involves decreased viscosity of certain gels with movement or shear, sometimes used metaphorically for tissue warming but not the primary mechanism of sustained stretch lengthening. Piezoelectricity (D) refers to electric charge generation in certain materials under mechanical stress; while discussed in fascia theory contexts, it does not directly explain the time-dependent deformation seen clinically. In practice, pairing sustained holds with patient breathing and avoiding end-range pain respects tissue tolerance and the nervous system’s role in tone modulation. Document perceived changes in ROM and comfort to track outcomes and inform subsequent care.