To answer this question, we need to identify the book that was written by Tulsidas. Let's go through each option:
Option A) Vinay Patrika - This option is incorrect because Vinay Patrika was written by Tulsidas' contemporary, Goswami Tulsidas.
Option B) Ramcharitmanas - This option is correct because Ramcharitmanas is an epic poem written by Tulsidas. It is one of the most famous works of Hindi literature.
Option C) Both (a) and (b) - This option is correct because Tulsidas wrote both Vinay Patrika and Ramcharitmanas.
Option D) Yashodhara - This option is incorrect because Yashodhara is a play written by Maithili Sharan Gupt, not Tulsidas.
Therefore, the correct answer is Option C - Both (a) and (b). This option is correct because Tulsidas wrote both Vinay Patrika and Ramcharitmanas.