Critical Thinking

Which of the following sentences is a FACT ?

Research on the effects of sleep deprivation has demonstrated its negative impact on cognitive function and overall well-being.

People generally believe that laughter is the best medicine for relieving stress.

As a result of missing her train to work, she arrived late for the meeting. The Cause in this sentence is:

The heavy rain flooded the streets, resulting in extensive damage to homes and businesses. The Effect in the sentence is:

As a consequence of the team's hard work and dedication, they achieved victory in the championship game. The Cause in the sentence is:

Due to the rapid technological advancements, communication has become more efficient and accessible to people worldwide. The Effect in this sentence is:

Many students prepare carefully before an important presentation. They practice speaking in front of a mirror and ask friends to listen to them. Some students record themselves and watch the recording to find areas they need to improve. Others prepare notes and organize their ideas before presenting. These steps can make the experience easier when it is time to speak in front of the class.

Question:
What is the main idea of the paragraph?