Which of the following sentences contains a gerund? OA.
OB.
OC.
OD.
Babysitting is an absolutely tiresome job when you have to watch kids all evening.
Most babysitters find that kids are tough to look after if they have irregular bedtimes.
Parents enjoy the luxury of a babysitter after a long workweek.
Agreat babysitter can be very influential in a young child's life.

this is what i put and it was correct

it's a way for authors to communicate with reader in this time period. books from the past can teach us about life.

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.

answer is b,

"the tracer looks harmless in flight, but the pilot’s bitten lips and white knuckles suggest how dangerous it can be."

it was correct.