Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A British university student has been ordered out of Russia amid claims she is a spy. History postgraduate Laura Sumner, 24, was given ten days to leave the country after being fined £23.50 for an alleged visa violation. But Russian media reports have branded her ‘Agent Sumner’ and linked her to a bizarre claim of a revolutionary plot. Laura Mary Sumner, pictured, has been ordered to leave Russia within ten days after being branded a 'spy' A pro-Kremlin website claimed she was one of a number of students carrying out research in Russia by British historian, Professor Sarah Badcock.Laura Mary Sumner has been ordered to leave Russia within ten daysMs Sumner was researching Soviet rule from 1917 to 1921 in a libraryOfficials claimed she was in Russia on a commercial not a study visaRussian media branded Ms Sumner 'a spy' due to her research interests 
 Question:Professor Badcock, 40, is supervising Miss Sumner’s PhD thesis on early _ but there has been no suggestion outside Russian media that either woman is involved in espionage or plans to foment revolution.

Russia