Which of the following groups is indigenous to mexico?
a. aztecs
b. spanish
c. portuguese
d. iroquois

Aztecs are the Indigenous group of Mexico! In fact, the word "Mexica" referred to the Aztecs originally . There are also other indigenous Groups in Mexico, such as the Mayas ( many Maya groups, for example  the Tzotzils) , Zapotecs, Omomi, Huichol and many others.

The answer for your problem would be a. 7

The answer is d., a mountain.