Causal relations can be found in "________".

Causal relations can be found in "________".
A、I’d love to join in. Only I don’t know howto play.
B、All the figures were correct. Yet the total came out wrong.
C、I was not informed. Otherwise I should have taken some action.
D、 All this time, the guard was looking at her, first through a telescope, then through a microscope.
【正确答案】：C