Answer:
B. Non Physical constraints
Step-by-step explanation:
Constraints can either be physical or non physical. Physical constraints has to do with those factors that can be seen and touched that limit work progress which are easy to identify, Such as resources, raw materials and supplies. Non physical constraints on the other hand are factors such as policies, measures limiting work progress that are harder to identify. Inflexible work schedules and inadequate labour skills are nonphysical constraints to getting the job done.