Is the comma after kitchen necessary? would it make a difference if the comma was removed?

just as i was hiding the tube of toothpaste, my brother came into the kitchen, looking for food.

Which passage from the story best shows the author's use of surprise to advance the story? a. i'd have gone up to the boss and told him just what i think, tell him everything i would, let him know just what i feel b. "oh, god", he thought, "what a strenuous career it is that i've chosen! travelling day in and day out." c. and he looked over at the alarm clock, ticking on the chest of drawers. "god in heaven! " he thought. it was half past six and the hands were quietly moving forwards, it was even later than half past, more like quarter to seven. d. one morning, when gregor samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin. submit