Select the most appropriate meaning of the given idiom. Make light of

Idioms are fixed phrasal expressions whose overall meaning is figurative rather than literal — the individual words rarely combine to their dictionary sense. In "make light of", "light" is used in the sense of "not heavy or serious", so the idiom describes treating a matter as unimportant, minimising how serious it actually is.

Applied here: to "make light of" something is to disregard or play down its seriousness — to behave as though it does not deserve real attention or concern. That is the sense of treating a matter with neglect for its true weight, i.e., "to ignore or neglect" how serious it is.

• "To be kind and grateful" describes warmth or thanks — unrelated to downplaying seriousness.

• "To fight with" describes conflict or confrontation — unrelated to treating a matter as trivial.

• "To think for a long time" describes prolonged deliberation — the opposite of dismissing something without much thought.

Cross-check with usage: "She made light of the criticism and carried on as if nothing had happened" — she disregarded and downplayed how serious the criticism was, confirming the sense of ignoring or neglecting its weight.