Name the apes which are the most primitive.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of the most primitive apes. To answer this, we need to identify which apes are considered primitive in the evolutionary context.

2. **Defining Primitive Apes**: In evolutionary biology, "primitive" refers to species that have retained more ancestral traits compared to others. This often means they have not undergone as much evolutionary change.

3. **Identifying the Most Primitive Apes**: Among the apes, Gibbons are recognized as the most primitive. They belong to the family Hylobatidae and are characterized by their smaller size and lack of tails.

...