Super easy
which of these is not an example of a theme map?
a map showing provinces and territories of canada
a map showing religions of african countries

Okay I'm positive it is A, read this

A thematic map is also called a special-purpose, single-topic, or statistical map. A thematic map focuses on the spatial variability of a specific distribution or theme (such as population density or average annual income), whereas a reference map focuses on the location and names of features.

a. it led to stricter immigration laws.