To answer this question, let's analyze the given information:
- Susan is taller than Sasha.
- Susan is shorter than Mark.
- Andrew is shorter than Sasha.
- Vanessa is taller than Mark.
Based on this information, we can conclude the following height order:
Vanessa > Mark > Susan > Sasha > Andrew
Therefore, Andrew is the shortest among the given individuals.
The correct answer is option D, Andrew.