There are four problems in the original sentence!!
Sting of Egyptian Scorpions => singular
Scorpion => its
Sting of Egyptian Scorpions cause the red welts ...... => it
Not parallel : cause - posing
Although the sting of
Egyptian Scorpions are rarely dangerous, they cause red welts to appear, posing minor health risks to infants, who are particularly vulnerable to its venom.
a)Egyptian Scorpions
are rarely dangerous,
they cause red welts to appear,
posing minor health risks to infants, who are particularly vulnerable to its
b) Egyptian Scorpions
are rarely dangerous,
they cause red welts to appear and pose minor health risks to infants, who are particularly vulnerable to
theirc)Egyptian Scorpions is rarely dangerous, it causes red welts to appear,
posing minor health risks to infants, who are particularly vulnerable to
theird)Egyptian Scorpions is rarely dangerous, it causes red welts to appear and poses minor health risks to infants, who are particularly vulnerable to its
e) Egyptian Scorpions is rarely dangerous,
they cause red welts to appear, posing the greatest danger to the infant, who are particularly vulnerable to its
Answer - D