Answer:
The correct answer is letter "A": In the end you probably won't have the information you need to solve your original problem.
Explanation:
A typical problem researchers find at the end of their study is the lack of relevant information that could allow them to solve the reason for the research. The issue, in fact, relies on the sources the researches chose to conduct the study. However, that scenario could be beneficial since it will allow the researcher to have a better idea of the type of information necessary.