Final answer:
Option a.
Yes, metamorphic rocks have been forming throughout all geological periods due to ongoing geological processes such as tectonic movements and mountain building.
Step-by-step explanation:
Metamorphic rocks are the result of the transformation of existing rocks through high temperatures and pressures, which typically occur during tectonic processes and mountain building.
Metamorphism can happen when rocks are buried deeply or when molten rock intrudes into rock layers, altering them physically or chemically. From igneous to sedimentary to metamorphic, rocks are constantly being recycled through the rock cycle.
Considering the enduring nature of these geological processes, it's true that metamorphic rocks have formed throughout all geological periods.
The formation of metamorphic rocks is not confined to any particular period of Earth's history but has been a continual process since the planet's formation, adapting to the shifting conditions.
Therefore, the final answer is a) True.