Answer:
<em>Last option</em>: They wore many layers of clothing and their friends snuck out more items in their bags.
Explanation:
In the letter of 8 July, 1942, Anne writes,
"We put on heaps of clothes as if we were going to the North Pole."
"Miep came and took some shoes, dresses, coats, underwear, and stockings away in her bag."