Concept:Quarantine in agriculture is a protective measure to control the movement of plants, animals, and their products across borders.
Explanation:When crops, livestock, or agricultural goods are brought into a country, they may carry hidden pests or pathogens.
Quarantine involves holding, inspecting, and sometimes isolating these items for a specific period.
This process helps to detect and block harmful organisms before they can enter and spread in local farms.
It does not focus on controlling import prices, preserving genetic purity, or introducing new varieties, as those are separate agricultural concerns.
The main objective is to safeguard food production and natural agriculture from invasive threats.
Therefore, quarantine measures are specifically designed to keep new pests and diseases from being introduced into an area.
Answer:B. preventing the introduction of pests and diseases