THE SOLUTION:
The first batter hit a single;
the second batter was called out on strikes;
the third batter hit a triple (scoring one run);
the fourth batter walked;
the fifth batter grounded out (scoring the runner from third, and moving the runner from first to second*);
the sixth batter popped out to the first baseman.
* – had the runner been thrown out going to second, it would have been a fielder’s choice, not a ground out