Rany is conducting research to support his claim that happy people are more productive in their jobs than unhappy people, and he finds this text in a reliable source.

(1) There are many different factors that affect workplace productivity. (2) Research tells us that an employee’s level of happiness can impact how he or she performs. (3) In fact, one study showed that people who identified as being happy are twelve percent more productive than their colleagues. (4) An employee’s interest level in a given subject or task and ability level are other factors that play a role in how that person does his or her job.

The sentence which contains a detail that best supports Rany's claim is, 'In fact, one study showed that people who identified as being happy are twelve percent more productive than their colleagues.'

Explanation:

Randy claims that when people are happy, they are way more productive as compared to the unhappy ones. This claim can be best supported from the third sentence. It is because the sentence supports the claim by providing statistical data about the percent of productiveness found in happy people. It also clearly addresses the topic, which is turn makes Randy's research quite reliable and effective.

what lesson are you referencing?