Answer:
The denotation of the word strong in this excerpt from Binding Memories is powerful. The correct answer is the first one.
Explanation:
In this context, the word strong means capable enough. Capable of sustaining "entire worlds", strong enough, powerful enough. I think the word that best describes the denotation is the first one because it embraces all the other adjectives; the spine is well built, it has the proper attitude, and is capable of holding big "weight". It is the guide, the one that supports other parts.
