Which words would require the most emphasis if you were explaining this step to a friend?
a.
"Turn the bottles over so the one on top holds the water. Quickly swirl the bottles in a big circle several times and place the bottom bottle on a flat surface."
c.
"Turn the bottles over so the one on top holds the water. Quickly swirl the bottles in a big circle several times and place the bottom bottle on a flat surface."
b.
"Turn the bottles over so the one on top holds the water. Quickly swirl the bottles in a big circle several times and place the bottom bottle on a flat surface."
d.
"Turn the bottles over so the one on top holds the water. Quickly swirl the bottles in a big circle several times and place the bottom bottle on a flat surface.