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 married couple accused of plotting a suicide bombing in London 'repeatedly' watched the martyrdom video of 7/7 bomber Shehzad Tanweer, a court has heard. Mohammed Rehman, 27, and wife Sana Ahmed Khan, 24, stockpiled chemicals and bomb-making material for a ‘catastrophic attack on London’, the Old Bailey heard. Rehman, using the name ‘Silent Bomber’ and a picture of ‘Jihadi John’ killer Mohammed Emwazi, allegedly took to Twitter to ask his followers to choose a target for the planned suicide bombing. Jurors heard today that Rehman had also hand-written a pledge of allegiance to the barbarous Islamic State and its leader Abu Bakr Al-Baghdadi.Married couple are accused of plotting a suicide bombing in LondonMohammed Rehman and his wife Sana Ahmed Khan stockpiled chemicalsCourt heard they watched martyrdom clip of 7/7 bomber Shehzad TanweerRehman had pledged allegiance to Islamic State in hand-written note 
 Question:Jurors were asked to watch the video, lasting 31 minutes, in which _ sets out his reasons for the 7/7 attack.

Shehzad Tanweer