The correct answer is option b. by vertical clinging and leaping.
The strepsirrhines are the primates, which follow VCL or vertical clinging and leaping type locomotion. This is a type of arboreal locomotion, used by the haplorrhine tarsiers also.
In the VCL type of locomotion, the animals generally rest with an upright torso, a fixed elbow and clinging with the help of hands on a vertical support, such as the sides of the trees or the bamboo stalk.