Which of the following statements is correct?
I. Montreal Protocol was signed in 1987.
II. Earth Summit 1992 was held at Rio-de-Janeiro.
III. World Environment Day is 5 June.
IV. World Environment Day coincides with commemoration of First United Nations Conference of Human Environment.
V. At DO below 4 mg/L water at normal temperature is heavily polluted.

Options

A. All
B. All except IV
C. All except II and III
D. None

Answer

A