PLEASE HELP FAST 30 POINTS
Which of the following correctly matches the first step of polymerase chain reaction (PCR) with its events?

a
Annealing - Taq polymerase extends the primers, synthesizing DNA
b
Evacuation- poly A segments fuse with primers to initiate sequencing
c
Denaturation - high temperature separates the DNA
d
Extension - reaction is cooled and primers bind to complementary sequences on template DNA.