The Difference-In-Differences Approach Relaxes Some of the Required Assumptions for Establishing

Multiple Choice

The difference-in-differences approach relaxes some of the required assumptions for establishing causality by leveraging what dimension of the empirical setting?

A) Observing repeated observations of the same cross-sectional units over time.
B) Observing multiple cross-sectional units receiving the treatment.
C) Observing a time series for one series.
D) Being able to construct an instrument from the first stage difference.