Which of the following does NOT help define lineation in some metamorphic rocks?

A) a dominant orientation of long crystals
B) alternating layers of dark- and light-colored rock types
C) stretched crystals
D) stretched pebbles
E) linear streaks formed by smearing of minerals

Lineation in metamorphic rocks is defined by features that show a preferred orientation or alignment, such as the orientation of elongated crystals, stretched pebbles, or linear mineral streaks. Alternating layers of dark- and light-colored rock types, however, describe foliation rather than lineation. Foliation is characterized by the parallel arrangement of mineral grains or structural features within the rock, leading to a layered or banded appearance, which is different from the linear or directional features that define lineation.