Final answer:
The only bullish option is long call short put.
Step-by-step explanation:
The bullish options in this case refer to options that indicate an expectation of the stock price increasing.
Option 1, long call long put, is not bullish because a long put involves betting on the stock price going down.
Option 2, long put short put, is not bullish either as it involves both a long put (expectation of stock price going down) and a short put (expectation of stock price staying the same).
Option 3, short call short put, is also not bullish because a short call involves betting on the stock price going down.
Option 4, long call short put, is the only bullish option as it involves a long call (expectation of stock price going up) and a short put (expectation of stock price staying the same).