Answer: The correct answer for the fill in the blank is B) Mood dependent memories.
Bringing up past frustrations in an argument reflects mood dependent memories. When a memory is encoded in the brain, it stores various information like visual, sensory data, emotional state as well as mood of the person.
Mood dependent memories occur when the current mood is similar to the mood that was at the time of memory storage. This means that when a person is arguing, the past frustrations will be retrieved at that time ( which stored the memory in the same mood).
It allows the plant to stand upright.