On Monday, the seller offers to sell his vacant lot to the buyer for $42,000. On Tuesday, the buyer counteroffers to buy for $40,500. On Friday, the buyer learns that several other prospects may be making offers on the property, so he withdraws the counteroffer and agrees to the original asking price of $42,000. Under these conditions, there is

b. not a valid agreement because the buyer's counteroffer was a rejection of the seller's offer, and once rejected, an offer cannot be accepted later.

Explanation:

Since in the question it is mentioned that the vacant lot is offered for $42,000 but the buyer counteroffers to buy $40,500 but afterward he agreed to the original price of $42,000

So this situation represents that it is not a valid agreement as the counteroffer made by the buyer was rejected by the seller and once it is rejected then the same could not be accepted

Therefore the correct option is b.  

answer: i'd say the answer is d because the information system is the human already doing the activity.

the u.s. census bureau produces data on the population and economy nationwide. it can you to analyze the kind of people living in your neighborhood. it does not show you the market of people willing to buy your product or an existing market for your product. that will require more market research. the census bureau only gives you an insight to the demographics in your area.