When a psychologist simply records the relationship between two variables without manipulating them, it is called a – study. The observed relationship does not by itself reveal which variable – the other. This is the – problem. Also, the relationship may be due to a – controlling both of the observed variables.

The Correct approach will be "correlational, causes, directionality and third variable".

Explanation:

Because then the answer is indeed the correct one.

answer: in july 1862

explanation: during the american civil war, president abraham lincoln and congress passed the revenue act of 1862, creating the office of commissioner of internal revenue and enacting a temporary income tax to pay war expenses. the revenue act of 1862 was passed as an emergency and temporary war-time tax.