Please match the method with the correct example

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Lab experiment

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Field experiment

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Natural experiment

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Conjoint Analysis

A$.$

Students were asked to participate in a computer study where they had to wear eye tracking glasses and look at differeent online ads and indicate their willingness to purchase a product.

B$.$

A regulation mandated that road and construction workers who wish to work in New York City should complete a $40$ hour safety training. This training is not required for workers operating in Chicago and Boston. To identify the effect of safety training on accidents we can use New York city as the treatment group and Chicago, Boston as the control group.

C$.$

Participants are repeatedly asked to choose one hotel from two different types of hotels. On each hotel they have information on review rating, price, amenities and location.

D$.$

A restaurant offers happy hour one week while not offering the promotion next week, records sales during both weeks to estimate the effect of offering happy hour on overall sales.