PT90.S2.Q13 - Main Conclusion

I say go go go

Can anyone explain how it's B and not D

I broke it down like this

• widespread--cause---writing bio to end
• explanation
• no revealing material unless password

I thought of it as MC for the end because it would justify why they did all this

yinthemaster

Same question. If D isn't the main conclusion, then I don't know what role does the last sentence of the stimulus play.