Malthus predictions did not come to pass mainly because

Step 1: Analyze the question The question asks why Malthus's predictions failed to come true. We need the main reason.

Step 2: The concept Thomas Malthus (1798) predicted that:

• Population grows in a geometric progression (1, 2, 4, 8, 16...)
• Food supply grows in an arithmetic progression (1, 2, 3, 4, 5...)

He concluded that population would outgrow food supply, leading to famine, disease and war (the "positive checks"), unless people used "preventive checks" like late marriage.

Step 3: Why it did not happen

• Technological advances in agriculture (machines, fertilizers, improved seeds, irrigation) raised food output far faster than Malthus expected.
• Birth control and family planning slowed population growth.
• Improved transport and international trade allowed food to be imported.
• Migration to new lands (the Americas, Australia, etc.) relieved population pressure in Europe.

Step 4: Evaluate the options

• A. Food and population grew at the same rate. Not accurate. Food output grew faster than Malthus expected, but it was not an exact match with population growth.
• B. Machines in agriculture were discouraged. False. Machines were widely adopted, which is the opposite of what happened.
• C. Many people died during epidemics. Epidemics did happen, but this would have supported Malthus's "checks," not disproved him.
• D. Many people emigrated to new lands. This is the best fit among the options. Mass emigration from Europe reduced population pressure, and the new lands also produced a large surplus of food.

Step 5: Answer Note that the strongest real-world reason is technological progress in agriculture, but since that is not offered correctly (option B says the opposite), emigration is the best choice.

Exam tip: For Malthus questions, remember the "failure" reasons: Technology, Birth control, Trade and Migration. Pick whichever appears in the options, and avoid options that would have supported his theory (like epidemics or famine).