How is this not biconditional/bidirectional? "All that is required"

How do you know when to draw out implicit premises in questions like this? #help

@Elijah_Mize Does "is any" "is all" "is each" etc, all indicate bidirectional (basically "is + sufficient indicator")?

I've seen a few problems with the implicit assumption. How can I recognize when an implicit assumption is present? @tutor

It would be great if you could help me close this gap! I can send timings if needed as well. All of my recent BRs have been between 175-179, but all of my scores are between 160-163. This was PTest 142.

Can someone reexplain why A is wrong? For the example he gave in the video:  "Smoking tends to cause lung cancer" and an AC that says "many people who smoke don't have lung cancer," in my mind that would weaken the arg. While that is not a strong weakener, I don't understand how it is considered to not weaken. In that same sense, how is A not a weakener? @LowriThomas

Thanks!

@JoelKeenan Hi, why can't we read the either/ors as conditional statements though to evaluate whether A is true or false? #tutorhelp

Can someone expain how, if you write A out, it still proves false:

A:

OPTION 1: econ weak ---> /invest decreasing (original conditional proves this is false)

OPTION 2: invest decreasing ---> /econ weak (contrapositive conditional DOESN'T prove false)

Can someone explain this better for me?