When Janice stopped paying attention to her daughter’s tantrums, they stopped by the end of the day. However, they reappeared the next morning, as well as on subsequent mornings. It is most likely that each time the tantrums appeared, they were than before.

Weaker

Explanation:

Jaunice daughters tantrum appeared weaker than they were before this is due to the fact that they didn't persist for a full day entering the next day. If they appeared stronger, they would have persisted despite not be paid attention to. If the situation persists, it might likely become weaker and weaker and there is a possibility it would stop in the future due to attention not shown to it.