Inorder : OBAXVRZPW
Preorder : XABOVZRPW
In every option they have given X as first, so first character X will be the root in preorder.
so inorder traversal got partitioned like OBA X VRZPW.
Left tree is OBA.
next in VRZPW right tree, look at preoder traversal, V will be the next root element.
similarly follow the steps until last element.
Kindly look at these other options too, They are also not wrong.