Which sentence supports the main idea that online shopping has made shopping easier and more convenient?
a. some people don’t like online shopping because it’s hard to judge product quality online.
b. shoppers no longer need to leave the house or spend hours at the mall to make purchases.
c. although online shopping is booming, most businesses don’t have well-maintained online stores.
d. more than half of online shoppers exit online stores if they are bored by the checkout process.

B. Shoppers no longer need to leave the house or spend hours at the mall to make purchases.

Explanation:

The main idea of an excerpt or paragraph is the important point which the writer wants the readers to convey to the writer. The main idea is clarified, expanded and explained with the help of the supporting details. The supporting details illustrate the main point and help in explaining the detail in a much better way. Supporting detail supports the main idea in the writeup. In the above case, option B is the supporting idea which explains the main idea about online shopping.

b. cronkite, a trusted television personality, declared that the war was unwinnable and told the american people that the government had better find a way out

even though it went against everything the news anchors typically stood for, cronkite voiced an opinion and took a stance, telling the us that there was no way they were going to win, the war was going to end in a stalemate. 

explanation:

the answer to your question is d because the clause conveys the tone of the man in the excerpt, which is arrogant and cocky. hope that .