A, In Fact, studies by scientists have found......
In fact followed up by an actual factually proven statement!
Huh? Is this a type of riddle lol?
Answer:
<h3>The antennas contained in mobile phones, including smartphones, emit radiofrequency radiation; the parts of the head or body nearest to the antenna can absorb this energy and convert it to heat.</h3>
The answer is 2. Onomatopeias are sounds like pop, boom, bang, pow, plop, etc.