If you aren't sure how long a task will take, you should skip it
B
do it last
с
give yourself only 5 minutes to finish it
D
give yourself extra time to finish it

we need the passage first

the answer would be a

the economic activity signified in that scenario is a. production

in general, market production makes reference to the elaboration of a product or service which is destinated for economic purposes (to be sold) at money-price in a market. such product or service has to be principally tradable for money.

there is no money exchange involved in distribution, generalized reciprocity or balanced reciprocity.