Question

__his son got the job,he was pleased

through
as
for
so
​

Answer 1

"As".

The persons son had gotten a job and he is pleased.

His pleasing is dependent on his son getting the job and is directly connected after it.

Hence through is the wrong choice as it is grammatically incorrect.

As is the correct choice as the reason is given before the main subject.

For is used when the reason is given after the main sentence :

eg. He was pleased for his son got the job.

So is wrong as it is grammatically incorrect.

Hence the correct answer will be

(ii) as.