Dna , rna, and starch these three are important biomolecules that play a vital role in your life even though you have never seen them.
The answer is A: salt content
Crystals in the metamorphic rock align parallel due to the direction of the applied force, during rock formation. These crystals are Muscovites, Micas, and Amphiboles etc. So, the correct answer to your question is C. And, metamorphic rocks from due to change in texture and mineral assembly, due to the pressure itself.