Choose the option that substitutes the phrase 'by virtue of one's post'.

A. Ex route
B. Ex post facto
C. Ex officio
D. Ex gratia
E. Ex parte

Choose the correct answer from the options given below:

C only

The correct answer is Option (1) → C only

Ex route: This means "off course" or "out of the way" and doesn't relate to someone's position.
Ex post facto: This means "after the fact" and doesn't refer to a current position.
Ex officio (C):This means "by virtue of one's office or position." It's a perfect substitute for the given phrase.
Ex gratia:This means "as a favor" and doesn't connect to the authority of a position.
Ex parte: This means "from one side only" and doesn't relate to someone's role or position.