Review the KWL chart. A 3-column table with 1 row. Column 1 is labeled What I Know with entry There is no gravity in space, so everything floats. Column 2 is labeled What I Want to Know with entry How do astronauts eat in space? Column 3 is labeled What I Learned with entry Blank.

Now read the passage from "Zero-Gravity Nutrition.”

While weightlessness may be a thrill, it is a problem for eating. Food scientists design meals that won’t fall apart and float away. One solution is the food itself. Another solution is the package. Using less wrapping helps. Little packaging means less chance of something floating away and causing harm. It also means less waste to remove.

Based on the passage, what is the best choice to enter in the "What I Learned” column of the KWL chart?

a)Weightlessness can be fun, but not when it causes food to float away.
b)Removing waste in space can be difficult and can cause problems.
c)Food packaging can be hazardous in space, so none should be used.
d)Scientists make food that won’t fall apart and that has very little packaging.