What is the author's stance regarding Kant's views on the objectivity of external world?
The
author partially agrees with Kants views but believes that his view is not
consummate.
Look at these lines -
"This relational objectivity does not necessary imply an ontological objectivity. Kant can defend his view of the external world against idealism, so long as he frames the charge of idealism at the relational qualities of objectivity."
The author states that Kant can defend his theory of objectivity of external world but it does not imply ontological objectivity.
So he partially agrees with Kant but believes that Kants views are not complete.
The author doesn’t exactly criticize Kants view as he himself later says that the external world is ontologically objective.
(c) is a more correct answer compared to (b).