The answer is A.
A stem plot shows every number with the tens place and above being on the left side while the ones place is on the right side.
For example,
9 is in the tens place while 4 is in the ones place. So, this would look like:
9 | 4
There is only one number with a "9" in the tens place and there is only two numbers with "10" in the tens place. This only sastisfys the first option.
Best of Luck!