Q: 84 (CDS-I/2010)

On which one of the following grounds, in August 2009' Scottish authorities released to return home Abdel Basset al-Megrahi, a former Libyan agent, jailed for life for the bombing of Pan Am Flight 103 on December 1988 that killed 270 people, most of whom were US nationals ?
question_subject: 
History
question_year: 
2010
question_exam: 
CDS-I
stats: 
0,136,232,96,136,104,32