Who wrote the autobiographical book, My Life : My Trees ?

To solve this question, the user needs to be familiar with the title and author of the book, "My Life: My Trees".

Option A, Joy Adamson, is the author of the autobiographical book "Born Free", which is about her experiences raising a lioness cub named Elsa.

Option B, Richard St. Barbe Baker, is the author of the book "My Life: A Tree Lover's Story", which is an autobiographical book about his life's work to protect forests and promote reforestation.

Option C, Konard Lorenz, is a Nobel Prize-winning ethologist and author of books such as "King Solomon's Ring" and "On Aggression", which are about animal behavior.

Option D, K.M. Tewari, is not a known author of the book "My Life: My Trees".

Thus, the correct answer is:

The Answer is: B, Richard St. Barbe Baker.