When viewed with his point of view, the (1) / entire episode assumes (2)/ a different colour altogether. (3)/ No error (4)

Answer

1

Explanation

from will replace with because -
from (Prep.) is used for showing somebody.s point of View
from one.s point of view: as far as one is concerned Look at the examples given below: From a financial point of view the project was a disaster.
From my point of view, the party was a complete success.
Hence, when viewed from his point of view, the is the right usage.