The question is asking about the crop for which the volume of international trade is relatively low compared to its total production.

Option 1: Rice - This is the correct answer. Even though rice is one of the most widely produced and consumed crops in the world, due to its high production and consumption in the same locale, especially in Asian countries, the international trade of rice is comparatively low. Thus, most of the rice produced is consumed locally, and less percentage of it is traded internationally.

Option 2: Coffee - Coffee is largely produced in tropical countries and consumed in non-tropical countries. Therefore, the international trade share for coffee is quite high since it often needs to be transported internationally from production to consumption points.

Option 3: Rubber - Rubber is an essential input in many industries, and the countries which produce rubber like Thailand, Indonesia, and Malaysia export a significant share of their product internationally.

Option 4: Wheat - Similar to coffee, the geographical spread of wheat production and consumption is such that a substantial portion of wheat production is traded internationally. Often the countries with surplus production export it to the countries with not enough wheat production.