Final answer:
The correct answer is 'está'.
Step-by-step explanation:
The correct answer to complete the sentence is option B. está.
When referring to the location of El Salar de Uyuni, we use the verb estar, which means 'to be' in a temporary state or location. In this case, El Salar de Uyuni is a specific place, so we use está to indicate its location.
For example, you could say 'El Salar de Uyuni está ubicado en Bolivia', which translates to 'El Salar de Uyuni is located in Bolivia'.
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