The correct options are
A Formation of itchy blisters
C Spreads by direct contact
D Spreads by droplet transmission.
Chicken pox is a viral disease. Its initial symptoms include development of rashes on chest, back and face, which then turn into itchy blisters. These blisters eventually develop all over the body.
It spreads by direct contact with an infected person. It also spreads by air and via droplet transmission.
Swelling of the parotid gland occurs in measles.