Question

the us recession in the 1970s was caused by
an oil embargo.
energy interdependence.
low unemployment.
president nixons resignation.

Explanation:

The 1970s US recession was heavily triggered by the 1973 oil embargo, where OPEC nations cut oil supplies to the US, causing a sharp rise in oil prices, inflation, and economic contraction. Energy interdependence is a broader concept, not a direct cause; low unemployment is the opposite of a recessionary trait; Nixon's resignation (1974) happened after the recession had already begun and was not a root cause.

Answer:

A. an oil embargo.