Premise: Jo immediately sat up , put her hands in her pockets , and began to whistle .<br>`` Do n't , Jo .<br>It 's so boyish ! ''<br>`` That 's why I do it . ''<br>`` I detest rude , unladylike girls ! ''<br>`` I hate affected , niminy-piminy chits ! ''<br>`` Birds in their little nests agree , '' sang Beth , the peacemaker , with such a funny face that both sharp voices softened to a laugh , and the `` pecking '' ended for that time .
Hypothesis: jo's head moved to a higher position