Answer:
A cause-and-effect text structure is used to explain why immigrants could be detained at the hospital complex.
Explanation:
A cause-and-effect text structure is when the author presents a reason why some things happen, presenting the cause and the effect of that scene. This means that the reason why such and such happen is given alongside the result of that.
In the given scenario from "Island of Hope, Island of Tears", the author Niall O’Brien uses the cause-and-effect text structure. He states how immigrants were detained at the hospital complex if any illness was suspected. In this statement, the cause is the detection of illness while the effect is the detention at the hospital complex.
Thus, the correct answer is the fourth/ last option.
