Choose the best word to complete this sentence:   la mujer al mercado.                a.  gato      b.  llora      c.  va      d.  canta

The best option to complete this sentences is "La mujer va (optionC) al mercado. This means that the woman goes to the market. We needed a verb to complete the sentence so option A is discarded immediately because it is a noun which means "cat". 
in the case of "llora", this means to "cries". and "canta" means  "sings".  So their meanings are not appropriated for the context of the sentence. 

The answer is " cientifica "

Your ancwer is c almost 2000000 squre feet