How is "Half-weight" classified in terms of age and weight?

"Half-weight" is classified based on the age and weight of a child, specifically referring to a scenario where a child's fare is calculated differently from adults based on their developmental stage. The correct choice indicates that the child's weight is calculated as 85 lbs considering their age.

This concept acknowledges that the fare structure for children accounts for a specific range of ages and weights, especially for those typically between 2 to 11 years old. Children in this range may have a different fare calculation compared to adults or infants, which is why the emphasis on a child whose weight reflects age considerations is significant.

The other choices do not accurately define "Half-weight." The first choice references a specific weight of 50 lbs without addressing the age calculation. The third choice pertains to adults receiving a reduced fare but does not relate to children's weight classification. The fourth option discusses special needs services, which is a different category and not directly linked to the age and weight classification for fare determination. Therefore, the selected answer is the most precise in the context of how "Half-weight" is evaluated in terms of both age and weight for fare purposes.