Final answer:
The provided passage does not contain specific information about the percentage increase in online grocery delivery services due to the pandemic, but it does mention an 18% uptick in spending in a different category and a decline in total food spending by U.S. households between 2006 and 2009. Additional research is required to answer the student's question accurately.
Step-by-step explanation:
The question refers to the impact of the global pandemic on online grocery delivery services in the United States, but the passage provided talks about a universal increase in spending in a different category—not groceries. The passage mentions an 18% uptick in spending within the United States during tough economic times, countered by a statistic from the Bureau of Labor Statistics' Consumer Expenditure Survey that shows that real total food spending by U.S. households declined by five percent between 2006 and 2009. Therefore, the correct answer to the percentage increase in demand for online grocery deliveries is not provided in the passage. Additional research would be necessary to determine the correct percentage. Based on the data from 2006 to 2009, it's clear that grocery spending had declined, and if we considered the similar economic impact during the pandemic, we could assume a potential decline or shift in spending patterns, but not necessarily an increase of 100%, 200%, or 250% in online grocery delivery as suggested in the question options.