TASK DEFINITION: In this task, you are given a sentence in the Spanish language. Your task is to translate the Spanish sentence into the English language.
PROBLEM: ¿Cuál es el modelo de muestreo cuyo principio es acceder directamente a las aglomeraciones naturales de unidades en la población? (obreros en fábricas, estudiantes en universidades…)

SOLUTION: What is the sampling model whose principle is to directly access the natural agglomerations of units in the population? (workers in factories, students in universities ...)

PROBLEM: Son órganos linfoides primarios

SOLUTION: They are primary lymphoid organs

PROBLEM: Señale la opción correcta

SOLUTION:
Point out the correct option