Why did the aztec city of tenochtitlán become one of the richest cities in the
world?
a. the richest residents of all the nearby cities came to settle in
tenochtitlán.
b. tenochtitlán became the center of the lucrative mesoamerican
gold-silk trade.
c. the aztecs discovered gold deposits just below the surface of
tenochtitlán's central lake.
d. the aztecs used tributes from conquered peoples to build
tenochtitlán into an impressive city.

D

Explanation:

A is incorrect because that's not how cities become rich.

B is incorrect because there was no Mesoamerican Gold-Silk trade.  (They didn't have silk!)

C is incorrect because it's just flat-out false.

D is correct because the Aztec Empire was made mostly of tributary villages (conquered peoples) that they collected wealth (tribute) from.  

d! i hope u get it ! xddd

depends on the age of the teen, many believe by the age of 16 a person should know the strong difference between right and wrong along with the difference between risky and immediate death. swimming with sharks might be dangerous but swimming with sharks while bloody meat is attached to you is just insane. even more if you have no idea what you're doing. however, no matter the age, as long as the person is skilled enough and has the mental and physical capacity to control their actions doing whatever sport they put their mind to is all that matters.