Correct Answer: (a) Vedic Samhitas, Brahmanas, Aranyakas, Upanishads
Note: Each of the Vedas is divided into four parts (or the sections). the correct order of them is Samhitas, Brahmanas, Aranyakas and Upanishads. Samhitas and Brahmanas form the Karma-Kanda segment of the Vedas. Aranyakas and Upanishads from the Gyan-Kanda segment of the Vedas. They explicitly focus on philosophy and spirituality.