ANSWER
Heterogeneous mixture
EXPLANATION:
Given information
From the above image, we can see that we have three elements named a, b, and c. The elements a and c are attached to each other while element b can move freely.
Recall that, the combination of two or more elements is called a compound.
The above image shows the combination of a compound and an element
Hence, we can say that it is a heterogeneous mixture
