Answer:
The word that correctly completes the sentence is:
<em>- </em><em>El poncho azul es </em><em><u>tan</u></em><em> caro como el sombrero de color oscuro.</em>
Explanation:
The translation of the sentence is:
- The blue poncho is <u>as</u> expensive as the dark hat.
In the sentence made, a comparative form called Comparative of Equality is used, in which it is mentioned that a noun is equal to another in a given quality or adjective within it, its Spanish writing format is, in Present, as follows:
Noun + <em>soy/eres/</em><em><u>es</u></em><em>/somos/son</em> + <u><em>tan</em></u> + adjective + <u><em>como</em></u> + noun.
As you can see, the only missing part in the sentence would be the word <u><em>"tan"</em></u> which is indispensable to form the comparative addressed, the other options are discarded since they would belong to a superiority comparative which in addition to being characterized by having the word <em>"más"</em> requires the word <em>"que"</em> after the adjective.