El niño del segundo piso. a. huye b. cayó c. crecieron

El niño cayó del segundo piso.

cayó is the conjugation of the irregular verb caer for the third person singular in the preterite tense. The preterite tense is one of two simple past tenses. It is used to describe actions that took place or were completed at a certain point in the past. So, this sentence means:

The boy fell from the second floor.

d: the brown case addresses whether the plaintiff has been afforded equal protection of the laws relative to those attending public schools.