A cause B. so C can't also cause B?

lawschoolplease1
Posts: 149
Joined: Mon Feb 06, 2012 1:56 pm

A cause B. so C can't also cause B?

Postby lawschoolplease1 » Sat Oct 05, 2013 1:14 pm

If we have...
A Causes B.
and we need to weaken this and the answer choice says:
C causes B.

Is this answer choice right or wrong?

My sense is that it doesn't matter if A causes B. C can also cause C. So it doesn't weaken. HOWEVER, it could also weaken by showing that B has another cause.

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Hotguy
Posts: 382
Joined: Mon Sep 16, 2013 12:33 am

Re: A cause B. so C can't also cause B?

Postby Hotguy » Sat Oct 05, 2013 1:20 pm

lawschoolplease1 wrote:If we have...
A Causes B.
and we need to weaken this and the answer choice says:
C causes B.

Is this answer choice right or wrong?

My sense is that it doesn't matter if A causes B. C can also cause C. So it doesn't weaken. HOWEVER, it could also weaken by showing that B has another cause.

It weakens.

Pancakes12
Posts: 269
Joined: Tue Jul 02, 2013 10:13 am

Re: A cause B. so C can't also cause B?

Postby Pancakes12 » Sat Oct 05, 2013 1:30 pm

Yes, both A and C could possibly both cause B. So you are right in thinking that it doesn't destroy the argument. But it does weaken it because it opens up another possibility. The correct answer to a weaken question only has to weaken ever so slightly.

Edited for grammar.

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Clearly
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Joined: Sat Feb 11, 2012 4:09 pm

Re: A cause B. so C can't also cause B?

Postby Clearly » Sat Oct 05, 2013 1:32 pm

Alternative cause weakens.

bp shinners
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Joined: Wed Mar 16, 2011 7:05 pm

Re: A cause B. so C can't also cause B?

Postby bp shinners » Mon Oct 07, 2013 3:00 pm

jlb251 wrote:So you are right in thinking that it doesn't destroy the argument. But it does weaken it because it opens up another possibility. The correct answer to a weaken question only has to weaken ever so slightly.


This is an important note - you have to weaken the argument, not destroy the argument. A lot of people get hung up on that.

But to the original question - as others have said, noting an alternative cause will weaken a causal conclusion.




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