Chinese college entrance exam question - not convinced with answer

The following text has been taken from the Chinese college entrance exam:

Two weeks earlier, my son, Ben, had got in touch. He'd moved to England with his mum when he was three and it had been 13 years since I'd last seen him. So imagine my [blank] when he emailed me saying he wanted to come visit me. I was [blank]!

The options for the first blank were:

A) Delight

B) Relief

C) Anger

D) Worry

The options for the second blank were:

A) Scared

B) Shocked

C) Thrilled

D) Ashamed

The correct answer for the first blank is A) Delight and the second blank is C) Thrilled.

I also agree with both, but on the first blank I believe that B) Relief should also be possible, if the second blank was C) thrilled, because (I assume) a father will probably worry, feel some pain, feel a bit distressed or of course miss his son, if he hasn't seen him in 13 years.

I mean, you could also choose D) Worry and A) Scared, since that also pairs with each other, correct? (Just like how you pair A) Delight and C) Thrilled with each other)