In John Williams' style of composition, all the elements you've mentioned play a significant role.
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Resolution of the music refers to how tension built up through harmony, rhythm, and orchestration is eventually resolved, leading to a satisfying conclusion or peace in the music.
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Ebb and flow in music describes the dynamic nature of his compositions, where musical ideas rise and fall in intensity, creating a sense of movement and emotional depth.
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A musical climax is a point in the composition where tension reaches its peak, often accompanied by a powerful orchestral moment or a significant melodic statement.
In summary, all of the above elements—resolution, ebb and flow, and musical climax—contribute to the overall emotional impact and storytelling quality that is characteristic of John Williams' music. Therefore, the answer to your question is all the above.