Why do self etch bonding systems tend to have less post operative sensitivity?

Why do self etch bonding systems tend to have less post operative sensitivity?
A . Self etch bonding does not remove the smear layer but modifies it, leaving the smear plugs intact
B . Self etch products remove & replace the smear layer
C . Self etch bonding removes collagen fibrils and replaces them with resin plugs
D . Self etch systems etch and bond simultaneously

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Answer: A