¿En qué opción se ejemplifica mejor la característica racional? a) Tuvieron que pasar cerca de 50 años para confirmar la teoría.
b) En un artículo publicado recientemente en la revista científica “Nature”, Munday y Parsegian reportaron la existencia de fuerzas repulsivas.
c) La levitación cuántica es, entonces, no sólo real sino aplicable en el corto plazo en materiales de pequeñas dimensiones.
d) Rosas Ortiz, O. (12 enero 2008). Detrás de la magnetorresistencia gigante, Conversus, 66(12).

english plz

Explanation:

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.

answer; block grants;