单选题 What does the fourth paragraph imply?

A、 It's of significance to make different reactions to the same things.
B、 Scientific reasearch is unreliable owing to the different observations.
C、 People try their best to make impartial observation.
D、 The way of observation varies from person to person.

【正确答案】 D

【答案解析】[解析]从第四段可知，每个人观察的方式、得出的结论都不同。故应选D。