In the market for new homes, consumer incomes rise...

In the case of normal goods, income and demand are directly related, meaning that an increase in income will cause demand to rise and a decrease in income causes demand to fall. For example, for most people, consumer durables, technology products and leisure services are normal goods.

Explanation:

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

a and b!

dfroos means which is a and b