A  É  (B  ·  C)  /  (B  v  D)  É  C  //  A  É  (B  v  D)  

T  T  T 
F  F 
F  F 
B and D must both be false for the v to be false. So fill in those truth values. Now I have all the truth values for all the statements in the conclusion. The next step it to start transferring them to the premises. Click here to see that.