When did harvesting crops by machine become possible? Farming equipment was improved to harvest crops quicker while using less fuel, allowing for machine harvesting.

Farmers used agricultural research to develop plants that grew faster and matured at the same time, making machine harvesting possible.

Farmers graded or leveled the land to the extent that machine harvesting of crops was made possible.

Farmers developed new techniques, such as crop rotation and deep plowing, which made machine harvesting possible.

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according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

hope this