Which of the following studies would be impossible to answer by means of a cross-sectional study?

A) At what age do most children first understand the concept of conservation of number?
B) Do sixth-grade children generally like music different from what first-grade children like?
C) Do the children who are the best artists at age 6 remain outstanding at art as they grow older?
D) Do older children generally have a better ability to memorize facts than do younger children?

Conservation of Number

A cognitive development concept where a child understands that the number of items remains the same regardless of arrangement or appearance.

Best Artists

A subjective evaluation referring to individuals who are considered superior in their field of art, based on factors such as skill, innovation, and impact.

Older Children

Older Children refers to children in the later stages of childhood, often characterized by more developed cognitive, emotional, and social abilities compared to younger children.