The girl ___________ is reading under the tree is my sister. A. who B. whose C. which D. whom Why B?

The girl ___________ is reading under the tree is my sister. A. who B. whose C. which D. whom Why B?

Of course, we should choose the a object clause who to replace the subject in the following clause
How is it possible to choose B
"Who" means "of XXX"
B doesn't make sense
Are you reading the wrong answer?

Your bag is on the desk

Where is your bag?

The teacher's desk is ( )the blackboard in the classroom.
The teacher's desk is ( )the blackboard in the classroom.
A.on B.between C.in the front of D in front

There is a big desk in the front of the classroom. There is a big desk in the front of the classroom