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 primary school has cancelled a trip to take youngsters sightseeing in London because of fears over an attack from ISIS fanatics on the capital. Year 5 pupils at St James' CE Academy in Hull, East Yorks, were due to visit the city but staff decided it was too dangerous. The trip was cancelled following Parliament's decision to begin air strikes on Syria and an alleged terrorist incident at an east London Tube station earlier this month. The school said eight concerned parents had already withdrawn their children from the visit and that the decision was in their best interests.St James' CE Academy, in Hull, were due to take children sightseeingSchool cancelled trip following alleged attack on Leytonstone Tube stationHead said eight parents had already pulled their children out of excursionSchool said decision was not 'taken lightly' and trip has been postponed 
 Question:Jane Daniels, headteacher at the school, said: 'The decision to cancel our Year 5 children's visit to _ has not been taken lightly.

London