Final Answer:
Vanessa tried to kill herself by over-dosing on pills. Option A is the answer.
Step-by-step explanation:
The statement "Vanessa tried to kill herself" indicates that she attempted sui-cide. Out of the given options, overdosing on pills is the most common method of sui-cide. Jumping from a height, slitting one's wrists, and carbon mono-xide poisoning are also methods of sui-cide, but they are less common than overdosing on pills.
If you or someone you know is strugg-ling with sui-cidal thoughts, please reach out for help. There are many resources available, and you don't have to go through this alone.
Option A is the answer.