Question

The hyphen in "self-sealing" is used because:

a) self modifies sealing
b) self is a prefix
c) self is a noun
d) sealing modifies self

Answer 1

b) self is a prefix

Step-by-step explanation:

Self is the prefix of to one owns, whihc basically directs or modifies the word that is next to it by saying to itself, in this case the word Self is a prefix and is modifying sealing, but that is what all prefixes do, but in this case it needs a hyphen because it could be read as a spelling mistake otherwise.