Mexico city is located on top of the aztec capital. because of this, when the city was expanding in the 1970s, major archaeological work was undertaken to preserve various temples and convert them into a national monument

d and a is the correct anwsers

explanation:

the section of the chart that represents a point at which a bill needs approval from a majority of people in both chambers to advance is j, as this is the only section before the bill becomes law which has both rows (symbolizing the chambers) converging into one, meaning that the two parts of the congress have to approve of it before it can march on with the process.