Whose textbook is this?It is mine.3Q

Whose textbook is this?It is mine.3Q textbook The first textbook ___ for teaching English as a foreign language came out in the 16th century.A,to be written B,written为什么不选a,A不也是被动吗?B的is呢? Whose book is this? Whose ruler is this? Whose bike is it? “Whose fork is that whose is this book? “Whose room is this? Whose it is? whose shirt is that Whose hat is this? Whose jacket is it? whose frisby is whose coat it is? whose hat is it whose bird is that? Whose is the shirt?.