Final answer:
The best translation for the sentence 'They are running to the store' in Spanish is 'Ellos están corriendo a la tienda.'
Step-by-step explanation:
The best translation for the sentence 'They are running to the store' is 'Ellos están corriendo a la tienda.' This sentence correctly conveys the action of running in the present moment and the destination, which is the store. The verb 'están corriendo' indicates that 'they' are currently engaged in the activity of running, and 'a la tienda' specifies the direction of their movement.
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