Answer B. stopped running The idiomatic expression ‘pulled up on their heels’ means coming to a sudden stop while moving. The eight athletes halted their sprint immediately upon seeing the youngest runner fall onto the ground.
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The poem conveys that empathy, compassion and human cooperation are far more valuable than winning individual competitions. True sportsmanship means lifting others up and celebrating collective harmony rather than personal glory.
The overall mood is deeply heartwarming, inspiring and uplifting. Although it contains a brief moment of tension and heartbreak, it culminates in feelings of universal harmony, mutual respect, compassion and shared triumph.
In a neutral atom, protons equal electrons, so there are 31 protons. Subtracting 31 protons from the mass number 70 gives 39 neutrons present in the nucleus of atom X.
Rutherford’s accelerating electrons should radiate energy and collapse into the nucleus, causing atomic instability. Bohr resolved this by proposing that electrons revolve in discrete non-radiating orbits called stationary states, preventing atomic collapse.