It's A
Irrigation was overused, the soil didn't get any rest (crop rotation is a younger invention), the result was salinization of the soil, which led to decline of Sumer.
<span>On May 24, 1844 Samuel F. B. Morse transmitted the first message on a United States experimental telegraph line (Washington to Baltimore) using the “Morse code” that became standard in the United States and Canada.</span>
The Counter-Reformation (Latin: Contrareformatio), also called the Catholic Reformation (Latin: Reformatio Catholica) or the Catholic Revival,[1] was the period of Catholic resurgence that was initiated in response to the Protestant Reformation.
Source - Wikipedia
Relationship between the portion of earth being studied and the earth as a whole is known as scale.
Christianity? I’m not so sure but I think this is the awnser