Select the correct option considering the following statements. a) The effective rainfall is uniformly distributed within its duration of specified period of time.b) The effective rainfall is distributed throughout the whole area of the drainage basin.

• A. Statement (a) alone is true
• B. Statement (b) alone is true
• C. Both the statements (a) and (b) are false
• D. Both the statements (a) and (b) are true
• E. Information insufficient