Sports & Leisure Quiz for 20 January 2012

A new sport quiz is available each week. Try our daily general knowledge quiz or work through our archive of daily and themed quizzes.

Question 1: The acronym "B.A.S.E.", as used in B.A.S.E jumping, stands for four categories of fixed objects from which one can jump, including buildings, antennae and earth (cliff). Which of these is the other?