Final answer:
Option d) related to gender differences in activity spaces is NOT part of Ravenstein's Laws of Migration, which instead include broader principles about migration trends and patterns without specific mention of gender.
Step-by-step explanation:
The Law of Migration that is NOT part of Ravenstein's Laws of Migration is option d) Men still have a bigger activity space than women and proof of that is in international migration by more men than women, although that is changing a bit in some places. Ravenstein's Laws focus on broader principles regarding migration trends, distances, and patterns such as Friction of Distance, Step Migration, and the Gravity Model, but do not specifically address gender differences in migration activity spaces.