Final answer:
The Controllers lecture is placed closely to Lenina and Franny's conversation to highlight the contrast between control and individuality.
Step-by-step explanation:
The Controllers lecture is placed closely to Lenina and Franny's conversation in order to highlight the contrast between the two. The lecture represents the control and conditioning imposed by the World State, while Lenina and Franny's conversation reveals their individuality and desire for emotional connection. This placement underscores the theme of the individual versus society, and adds depth to the story.