Which of the Following Statements Is Based on Scientific Observation

Which of the following statements is based on scientific observation and reasoning?

A) Some chemical compounds react differently in different human cultures.
B) If a tree falls in a forest but this is never witnessed by a human,there are no physical or biological consequences.
C) Many physical and biological phenomena lack any cause-and-effect; outcomes from one situation may be one way today and another tomorrow.
D) Objects fall downward anywhere on the earth's surface,regardless of the observer.
E) A scientist records only the data that are easiest to interpret..