Final answer:
The other two streets are likely flat and straight.
Step-by-step explanation:
The question asks what can be inferred about Geary and Gough streets in San Francisco based on the knowledge that Lombard Street is exceptionally steep and curvy. From this information, we can infer that the other two streets are not steep and curvy. Lombard Street is unique in its steepness and curves, so it does not necessarily indicate the same characteristics for the other streets. Therefore, option 2) They are flat and straight is the most logical inference.