Addison has decided to learn transcendental meditation (tm). she will be given training in

This training useful is that meditation can Increases the activity of the sympathetic nervous system. She will be trained in a technique for detaching oneself from anxiety and promoting harmony and self-realization by meditation, repetition of a mantra, and other yogic practices. 

i am going to guess that it is co2.

the answer to your question is:

c. complementary base-pairing