Final answer:
c) A Doji candlestick. The second candle in a morning star pattern typically produces a Doji candlestick, which signals indecision and potential reversal from a downtrend when followed by a subsequent bullish candlestick.
Step-by-step explanation:
The second candle in a morning star pattern typically produces a Doji candlestick, which is option c). A Doji candlestick is a candlestick with a small body and may have long shadows, indicating that there was indecision in the market during the time period that the candle represents. This is because the opening and closing prices are very close to each other, and it is a sign of reversal following a downtrend. The Doji in a morning star pattern is significant because it indicates the possibility of a shift in the market sentiment from bearish to bullish. However, to confirm the reversal, the third candlestick in the pattern should be a large bullish candle that closes above the halfway point of the body of the first candle in the pattern.