The correct answer is: a) Remote areas.
Limited access to quality veterinary services is a constraint for livestock farmers in Assam, especially in remote areas. This is because remote areas are often far from veterinary clinics, and farmers may not have the means to transport their animals to these clinics. Additionally, there may be a shortage of qualified veterinarians in remote areas. As a result, livestock farmers in remote areas may not be able to get the care their animals need when they are sick or injured.
Option b) Urban centers is incorrect because there are usually more veterinary clinics in urban centers than in rural areas. This means that livestock farmers in urban centers are more likely to have access to quality veterinary services.
Option c) Tea garden areas is incorrect because tea garden areas are often located in remote areas. As a result, the same constraints that apply to livestock farmers in remote areas also apply to livestock farmers in tea garden areas.
Option d) Industrial zones is incorrect because industrial zones are often located in urban areas. As a result, the same constraints that apply to livestock farmers in urban centers also apply to livestock farmers in industrial zones.