One reason for Jeremiah's condemnation of Israel was that they

Jeremiah was a prophet in the Old Testament who was known for his condemnation of Israel. One of the reasons for his condemnation was that the people of Israel had broken their covenant with God and had started to follow other gods called baals. This means that option C is the correct answer to this question.

The people of Israel had made a covenant with God where they promised to worship only Him and follow His commandments. However, they started to worship other gods and idols which was a direct violation of their covenant with God. This made Jeremiah very angry and he spoke out against this practice.

It is important to note that the other options listed in this question are also sins that were condemned in the Old Testament. For example, option B talks about cultism and harlotry which were also practices that were condemned by the prophets. Option A talks about abandoning rural life for cities, which may not necessarily be a sin, but it was seen as a move away from the traditional way of life that God had given to the Israelites.

In conclusion, option C is the correct answer to this question because it directly relates to the reason why Jeremiah condemned Israel. However, it is important to understand the context around the other options as well.