Final answer:
Miocene hominoids displayed a range of locomotor behaviors including suspension, arboreal quadrupedalism, and terrestrial quadrupedalism, as evidenced by their skeletal structures. Hence, the correct answer is 'd. All of the above'.
Step-by-step explanation:
The locomotor behaviors characterizing Miocene hominoids include suspension, arboreal quadrupedalism, and terrestrial quadrupedalism. Miocene hominids, such as those found during the Miocene epoch (around 23 to 5 million years ago), exhibit various modes of locomotion reflected in their skeletal structures. The analysis of these structures suggests that these primates were capable of brachiation, moving through the trees by swinging from branch to branch thanks to their long arms. They also engaged in arboreal quadrupedalism, moving through the trees on all fours, which is indicated by the equal length of their arms and legs. Furthermore, evidence suggests that some Miocene hominids also practiced terrestrial quadrupedalism, walking on all fours on the ground, similar to many quadrupedal primates.
Therefore, the correct answer to the question 'Which of the following locomotor behaviors characterizes Miocene hominoids?' would be d. All of the above.