Consider the following statements : (a) The Himalayan rivers are formed by melting snow and glaciers. (b) Therefore the Himalayan rivers flow continuously causing floods. (c) During mansoons Himalayas receive very heavy rainfall. (d) The rivers well causing frequent floods. Now state wheter :

• A. All the four statements are correct thought (a) and (c) are not necessarily the causative factors of (b) and (d) respectivey.
• B. (b) is correct and (a) is the correct causative factor there of
• C. (d) is correct and (c) is the correct causative factor there of
• D. (b) and (d) both are correct and (a) and (c) are the correct causative factors there of respectively.