Answer:
C. Social Media has many positive effects on education, including better communication, timely information, socializing online, learning, enhancing skills, making a career among others. (Tula's International School)
The answer is: [B]: Gastro-
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(Note: Think: "gastrointestinal" (GI);
"gastric bypass";
"GERD" (for "gastroesophageal reflex disease");
"gastroenterology" / "gastroenterologist";
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Answer choice [A]: "Chiro-" refers to: "hand" (e.g. "chiropractor").
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Answer choice [C]: "Cord/o-" refers to: "cord", or "spinal cord";
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Answer choice [D]: "Dom- " is either non-existent or little known
(in terms of medical terminology).
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First: a paper and a pen
Second: your head
Third: "a colourful mind"
The middle one is the right answer.
Thanks!