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 their

c)Egyptian Scorpions is rarely dangerous, it causes red welts to appear, posing minor health risks to infants, who are particularly vulnerable to their

d)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

my doubt: although i selected D in this SC but i want to understand whether the construction "it causes red welts to appear, posing minor health risks to infants" in option C is wrong? honestly i do not feel that it is so wrong to eliminate option C on this basis. in fact i eliminated option C because of the construction "vulnerable to their"