Hint: Shatpatre is a Marathi book. It is a letter written in the Marathi language in the time of freedom struggle and therefore was written by one of the freedom fighters. The letter was published in a weekly known as Prabhakar.
Complete answer: The letter Shatpatre is written by one of the prominent freedom fighters Gopal Hari Deshmukh. He wrote many articles and essays in the weekly published in Maharashtra to bring social reform in the region. His articles held in arousing patriotic feelings among the citizens of India. All the writings of Gopal Hari Deshmukh return under the pen name of lokhitwadi. Various social issues such as child marriage dowry widow remarriage system and others were covered under his writings. Gopal Hari Deshmukh started writing articles published in Maharashtra at the age of 25. During those Times literature plays a prominent role in conveying the message of nationalism and Patriotism to the common people and therefore various newspapers and weekly magazines were started by prominent freedom fighters all over India.
Thus, the correct answer is option B.
Note: Indian freedom struggle was marked by patriotic literature in the form of newspaper articles and magazines published all over the country. The Britishers try to control the data or information circulating through the newspapers and magazines by imposing censorship on the literature published and therefore, various leaders wrote under the pen names.