Final answer:
Professor Maslova's difficulty in recalling new students' names because of memories of former students is an example of proactive interference, where old information hinders the recall of new information. Thus, the option C is the correct answer.
Step-by-step explanation:
The situation described with Professor Maslova having difficulty remembering the names of new students due to the many memories of former students exemplifies proactive interference. Proactive interference occurs when old information inhibits the ability to remember new information. In this case, the professor's numerous memories of past students' names are making it more challenging to recall the names of current students.