To 'inflame' can mean to:

The term 'inflame' primarily refers to the act of arousing strong feelings or passions, often related to emotions such as anger, excitement, or desire. This can manifest in various contexts, such as inciting enthusiasm in a crowd or provoking anger in a debate. The essence of 'inflame' suggests intensifying a specific emotional state or reaction, leading to heightened feelings among individuals.

In contrast, the other choices imply an opposite or unrelated concept. Encouraging calmness involves promoting tranquility, which is the opposite of inflaming emotions. Becoming agitated suggests a state of unrest, but does not encompass the broader idea of inducing passion or strong reactions. Lastly, suppressing enthusiasm directly contradicts the notion of inflaming, as it involves reducing emotional engagement rather than enhancing it. Thus, 'arouse feelings and passions' is the most fitting interpretation of 'inflame.'