In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

_____________ who argue in this way support their case by pointing to the lack of a general consensus of opinion which obtains in many parts of the field which the philosopher regards as his own; and also by ____________ out that, even within this field, there is a growing tendency ___________ the part of certain sciences to separate themselves from philosophy and _____________ independent. Thus the psychologist and the logician are sometimes very anxious to have it understood that they belong among the scientists and ___________ among the philosophers.