The correct answer is C) It supports the balance between opposing forces.
Although you forgot to include the quote, we did some research and can answer the following.
The central idea of the quote reflects the ideas of Taoism in the following way: It supports the balance between opposing forces.
This is the quote that is missing. It belongs to Tao Te Ching, Laozi: "The Way gives birth to the One. The One gives birth to two. Two give birth to three. All three give birth to all things. All beings support the yin and embrace the yang. And through the blending of qi (energy), they create harmony."
So as we can read in the quote. Taoism refers to the correct balance of opposite forces to live in harmony: good and bad, black and white, fear and love.
One good example is the symbol of the Ying and the Yang, in which the black sign has a white dot and the white sign has a black dot. This is the perfect balance of energy in everything that exists.