Final answer:
The biggest potential problem with selecting a topic at random is the difficulty in finding sources to support your research. The correct answer is option A.
Step-by-step explanation:
The biggest potential problem with selecting a topic at random is that you may have trouble finding sources to support your research. When you choose a topic randomly, there is no guarantee that there will be enough credible and relevant sources available for you to gather information from. It's important to have reliable sources to back up your arguments and provide evidence for your claims. Therefore, it is recommended to carefully consider the availability of sources before selecting a topic.