Based on the general approach, the answers to the questions would be:
Without the graph, we cannot definitively answer which option (a, b, c, or d) is correct. However, the approach to determine this would involve comparing the performance trends as described.
Similarly, without the graph, we cannot definitively answer which option (a, b, c, or d) is correct. The best investment would be the one with the highest growth over the period.
If the graph were visible, you would apply the steps above to determine the correct answers.