Final answer:
Erna should choose an index fund that tracks the S&P/TSX Composite Index for long-term capital appreciation and market mimicry. Index funds provide diversification and tend to have low fees, aligning with her investment goals.
Step-by-step explanation:
Considering Erna's goal for long-term capital appreciation and her interest in a mutual fund that tracks the S&P/TSX Composite Index, the most appropriate type of mutual fund would be an index fund. An index fund is a type of mutual fund with a portfolio constructed to match or track the components of a market index, such as the S&P/TSX Composite Index. It provides broad market exposure, low operating expenses, and low portfolio turnover.
These funds follow their benchmark index no matter the state of the markets and aim to replicate its performance. Erna should look for a mutual fund that specifically states it aims to track the performance of the S&P/TSX Composite Index. By doing so, the value of Erna's investment will fluctuate along with the average of the overall stock market reflected in that index. This strategy employs diversification by holding a variety of securities, which helps reduce the risk associated with investing in individual stocks.