Final answer:
If the entrance lane is too short to allow acceleration to expressway speed, the correct option is A) Signal and merge quickly.
Step-by-step explanation:
If the entrance lane is too short to allow acceleration to expressway speed, the correct option is A) Signal and merge quickly. This means that you should indicate your intention to merge into traffic by using your turn signal and then merge into the available gap as quickly as possible without causing any disruption to the flow of traffic.
By signaling and merging quickly, you can ensure a smooth and safe merge onto the expressway. It is important to be aware of the speed and flow of traffic and adjust your merging speed accordingly to blend in with the existing traffic.