In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.

The Ashoka pillars are a series of columns (1)_____ in northern India by King Ashoka (2)______ his reign in the 3rd century BCE. (3)_____ pillars are inscribed with edicts by the Mauryan king. At an average (4)______ 50 feet in height and weighing up to 50 tons each, (5)______19 pillars survive today.

Q:

Select the most appropriate option for blank No. 4.

• 1
  by
• 2
  at
• 3
  of
• 4
  on