Answer:
The following may be true of metamorphic rocks:
They contain flattened or folded pebbles.
They display shear zones.
They have preserved structures from before the rock was metamorphosed.
Note: The statement "the entire rock body has recrystallized after being completely melted" is not universally true of metamorphic rocks, as some metamorphic rocks form through recrystallization without melting. The statement "no new minerals or new structural features have formed; no change to the prior rock" is not true, as metamorphism typically involves the formation of new minerals and structural features in the rock. And the statement "most metamorphic rocks have folds" is also not true, as fold structures are common in some types of metamorphic rocks, but not all.