Final answer:
The correct treatment for contrast media extravasation involves using a cold wet towel and applying pressure to the injection site.
Step-by-step explanation:
The proper treatment for contrast media extravasation into tissues around a vein includes the application of a cold wet towel to the affected area to reduce swelling and limit the spread of the contrast media. Additionally, applying pressure to the injection site can help control the extent of the extravasation. Therefore, the correct answer to this question is c. 1 and 3 only, meaning both application of a cold wet towel and application of pressure to the injection site are recommended.