Answer:
d. marginal analysis.
Step-by-step explanation:
Marginal analysis is the method used to analyse the additional benefit of adding cost or actions to the activity or cost of production. It helps the management to maximize the profit on production or benefit of additional action taken, it also help to balance cost and benefit of production.
It evaluates the relationship between cost and benefits.
In the given case, drinking lemonade is the additional mowing for mowing her yard. Here, she need to analyse how drinking additional glass of lemonade can benefit her in mowing activity.