When formulating a research question for an informative essay, a writer should write a question that
can be answered with a sentence.
has a widely known answer.
has an open-ended answer.
is difficult or impossible to answer.

C.  has an open-ended answer.

Explanation:

A open-ended answer is where it cannot be answered by a yes or no.

Making it interesting and curious, were people want to read what you have written.

They don't want a question to widely know, but not to narrow for multiple paragraphs. And of course they want you to answer and the question.

the industrial development of cities in the ruhr area in the nineteenth century is described. the research was based on english and german language sources. several factors that shaped growth and paths of the cities were categorized and analyzed. they are locations, resources, traditions, entrepreneurs, and technological developments. locations and resources were the most important among them; other factors may be regarded as consequences from locations and resources. among the cities, bochum, essen, gelsenkirchen, and dortmund had the richest resources and most favorable locations in the transportation network and grew to be the largest cities in the ruhr area near the end of the nineteenth century. riverside location was also a favorable factor for the development, as shown in the development of duisburg on the confluence of rhine and ruhr. resource distribution can explain the rise of textile industry, metallurgical industry, and coal and iron industries, and the northward progression of the mining industry. tradition was an important factor for cities such as krefeld, barmen, elberfeld, solingen, and remscheid, which experienced development based on their traditions through the nineteenth century. various entrepreneurs exerted influences within and beyond the local level over the ruhr area. technological development stimulated the northward progression of the mining industry and the deep connection between the coal and the iron industries.

international economic development agencies harm poorer nations by encouraging them to serve as exporters to wealthier nations.