Final answer:
The correct option is 'convince' as a speech that asks for intellectual agreement and action aims to persuade the audience.
Step-by-step explanation:
The correct option that completes the sentence is convince. In a speech that asks for both intellectual agreement and action, the goal is to convince the audience to take a certain course of action. The speaker presents arguments and evidence to persuade the listeners to agree with their viewpoint and take the desired action.
For example, a speaker advocating for stricter environmental regulations might present scientific data and appeal to the audience's sense of responsibility for the planet.