Answer:
C - So that
Step-by-step explanation:
Lets just plug in each word option into the sentence, and see if it makes sense.
So first of we have "although":
i rang him although he would know about the delay
This makes a bit of sense, so lets leave it here.
Next we have "inspite of"
i rang him inspite of he would know about the delay
This doesnt make any sense. The "of" does not fit, and the word choice "inspite" does not fit into the sentence either.
So this isnt a option.
Next we have "so that"
i rang him so that he would know about the delay
This make sense, because it is grammatically correct, and the purpose of calling "him" seems accurate too.
So lets leave this one here as well.
Finally we have "in order to"
i rang him in order to he would know about the delay
Again, the grammar is awful, and none of the words are accurate in the sentence.
So this isnt a option either
We are now left with A and C.
i rang him although he would know about the delay
i rang him so that he would know about the delay
So I think its c.
C perfectly fits, and makes sense in this setence.
Its a bit more difficult to see, but although does not really fit.
This is because the sentence used the word "would".
This indicates in the future "him" would know.
Because of this, it would not make sense to say "although", because he would not know yet.
So the correct answer is C.
Hope this helps!