You will be given a definition of a task first, then some input of the task.
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. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.

Put away the flip flops and the sunglasses, as an Arctic airmass is on the way. After one of the warmest Aprils on record, there will be a dramatic change next week with temperatures set to fall by around ten degrees. The plunge means Britain will go from being hotter than Turkey and Ibiza to colder than Moscow, Stockholm and Finland in a matter of days. It also threatens to cause a wet and miserable time for the thousands of runners taking part in Sunday's London Marathon. Scroll down for video Red sky in the morning, shepherd's warning: Forecasters predict that temperatures are set to plunge by 10CWeather experts predict temperatures will dip by around ten degreesPlunge means Britain will be colder than Moscow, Stockholm and FinlandArctic airmass from Iceland to blame for the sharp change in temperatureForecaster also predict thousands of runners could be in for wet London Marathon 
 Questions:According to forecasters we will begin to see the Arctic airmass, also known as a polar maritime mass, on Saturday after it has blasted over from _. (A) Arctic (B) Britain (C) Turkey (D) Ibiza (E) Moscow (F) Stockholm (G) Finland (H) London Marathon (I) 10C (J) Iceland
Output:
(J)