It would be "C. on the plane" where <span>Lyndon </span><span>b. Johnson was sworn in as President, since this was immediately after President John Kennedy was shot. </span>
<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be "the Fertile Crescent", since this is where the environment was most conducive to planting. </span></span>
