The correct option is A Agriculture
Even though industrial output or the production of goods went up by more than nine times during the period, employment in the industry went up by around three times. The same applies to the tertiary sector as well. While production in the service sector rose by 14 times, employment in the service sector rose around five times. As a result, more than half of the workers in the country are working in the primary sector, mainly in agriculture, producing only about one sixth of the GDP. In contrast to this, the secondary and tertiary sectors produce the rest of the produce whereas they employ less about half the people. Does this mean that the workers in agriculture are not producing as much as they could? What it means is that there are more people in agriculture than is necessary. So, even if you move a few people out, production will not be affected. In other words, workers in the agricultural sector are underemployed.