Involves following a group of research participants for an extended period of time.
archival research
longitudinal research
naturalistic observation
cross-sectional research

longitudinal research

Explanation:

A longitudinal survey is an observational study in which data from the same sample are repeatedly collected over an extended period of time, as is the cross-sectional study. This type of research involves following a group of research participants for an extended period of time.

Longitudinal study can take a long time, even decades, depending on the type of data needed to collect. The benefit of the longitudinal study is that researchers can take notes of changes, make observations and detect any changes that occur in the characteristics of their participants and allow a coherent sequence of data to be established.

answer: a

explanation:

first of all, it's important to say that the book we shall not be moved, written by joan dash, is about the first strike of women in the united states in the year 1909. the best historical detail to clarify the reader's undertanding is the phrase "general strike". this strike involved women working at a garment factory who decided to protest   long working hours, low wages and brutal conditions. this strike became known as "the new york shirtwaist strike" or "the uprising of the 20,000". the strike mostly involved jewish women who did not speak english or who had a basic knowledge of the english language. finally, the strike went on from november 1909 until february 1910.