A "Instead, they made radical changes to their initial models," - lines 3-4 (replacement).
B "Unfortunately, they are usually wrong." - line 15 (reason).
C "Alternatively, some good ideas take something in customers' lives that's pretty boring." - lines 45-47 (cause).
D "Next, you'll need to identify some analogs," - line 50 (exemplification).
E "beliefs you hold about the answers to your questionsdespitehaving no real evidence." - lines 64-66 (consequence).