In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

[EX Q]: This son of Robert the Devil began construction on the White Tower in London. This ruler's claim to the throne was backed by Pope Alexander II. This man ordered the creation of the Domesday Book. His queen was Matilda and Henry I was his son. This man's victory over Harold II began the Norman rule of England. For 10 points, name this ruler who won the Battle of Hastings and became King of England in 1066.
[EX A]: History

[EX Q]: Notably, one of these entities is absent in the Leishmania mexicana GPI8 protein, and abnormally low numbers of pericytes occur if one is missing from PDGF. Binding of 14-3-3 proteins to GABAB ["Gabba-sub-bee"] receptors does not occur when two arginines are mutated to alanine in one of these entities, which also binds to the COPI complex. They are usually C-terminal signals, and a common mammalian one consists of the amino acids lysine, aspartate, gluatamate, and leucine, or KDEL. hnRNP C proteins contain one of them that allows them to override nuclear export signals. For 10 points, name these signals important in directing proteins to the correct membranes, most often used to prevent a protein's export from the endoplasmic reticulum. 
[EX A]: Science

[EX Q]: The results of this experiment were supported by the absence of a realignment in the parallel-plate capacitor used the Trouton-Noble Experiment. The apparatus used in this experiment was rotated atop a stone slab within a mercury pool and made use of a 45 degree mirror that split light into two separate beams. Carried out at present day Case Western Reserve University with the aid of an interferometer, for 10 points, name this doubly-eponymous 1887 experiment that disproved the existence of luminiferous ether.
[EX A]:
Science