- The industrial revolution was a period of rapid industrialization that occurred between the 18th and 19th centuries. It brought significant changes in manufacturing processes, transportation, and agriculture, leading to the transformation of societies from agrarian to industrial.
- After the industrial revolution, several significant changes took place, including an increase in the demand for raw materials and a shift in the monetary value of raw materials compared to manufactured goods.
- Let's analyze each option to determine which ones occurred after the industrial revolution:

a) The demand for raw materials increased:
During the industrial revolution, the demand for raw materials significantly increased. With the rise of factories and the mass production of goods, industries required larger quantities of raw materials such as cotton, iron, coal, and timber. This increased demand led to the expansion of mining, logging, and agricultural activities to meet the growing needs of industry. Therefore, option a) took place after the industrial revolution.

b) The monetary value of raw materials declined in relation to manufactured goods:
This statement is incorrect. During the industrial revolution, the monetary value of raw materials generally increased in relation to manufactured goods. As industries grew, the value of manufactured goods also increased due to the efficiency and productivity brought about by new technologies and machinery. Raw materials became more valuable as they were essential inputs in the manufacturing process. Therefore, option b) did not take place after the industrial revolution.

c) The monetary value of raw materials inclined in relation to manufactured goods:
This statement is incorrect. The correct term would be "declined" instead of "inclined." However, as mentioned earlier, the monetary value of raw materials actually increased in relation to manufactured goods after the industrial revolution. Therefore, option c) did not take place after the industrial revolution.

d) Only 1 and 2:
Option d) states that both the demand for raw materials increased (option a) and the monetary value of raw materials declined in relation to manufactured goods (option b) took place after the industrial revolution. This option is incorrect because option b) is not accurate. Therefore, option d) did not take place after the industrial revolution.

In conclusion, the correct answer is option a) - The demand for raw materials increased. This is the only statement that accurately describes a change that occurred after the industrial revolution.