WHICH OF THE FOLLOWING WAS/ WERE EXPLORED BY LIVINGSTONE

156. Which of the following was/ were explored by Livingstone? (a) A river in Western Luanda (b) Scotland (c) The origin of river Nile (1) (a) and (b) only (2) (b) and (c) only (3) (a) and (c) only (4) (a) only (5) (b) only