Final answer:
In the tumor problem, the condition that performed best was option d) B and C had equal performance. Providing both an analogy and telling the students that it would help had the best outcome.
Step-by-step explanation:
In the tumor problem, the condition that performed best was option d) B and C had equal performance. This means that when students were given the analogy and were also told that it would help, their performance was equal to when they were not given a hint or just given an analogy without being told it would help.
By comparing the performance of the different conditions, we can conclude that providing both an analogy and telling the students that it would help had the best outcome in this tumor problem.
It's important to note that this answer assumes that the tumor problem is referring to a specific experiment or study where conditions were tested. Without more context, we can only interpret the question based on the given options.