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Also had difficulty in figuring out the sufficient/necessary....

it says it is healthy to do.... so my diagram (in my mind, didn't really draw it) is

healthy - > not detract

but after checking the correct answer A, i think the correct diagram is
principle: (engage intellectural -> not destract) -> healthy
application (engage intellectual, destract) -> not healthy

so it's basically is

a -> b
not a -> not b

???

am i correct or i'm just thinking too much?? thanks!

Actually, your original interpretation seems right.

The Principle is that, in order to be a healthy, intellectually developing activity, the activity must not detract from social development. In short (as you suggested):

healthy --> not anti-social.

The application tries to play the contrapositive, which would be:

anti-social --> not healthy.

However, the application doesn't say that reading detracts from her social development. Instead, it states that reading merely reduces her interactions. So, the application is saying:

reduce interactions --> not healthy.

However, reducing interactions and detracting from social development are two different concepts. The author assumes otherwise, and (D) points out that flaw.

HTH

- Chris

KaplanLSATInstructor wrote:Actually, your original interpretation seems right.

The Principle is that, in order to be a healthy, intellectually developing activity, the activity must not detract from social development. In short (as you suggested):

healthy --> not anti-social.

The application tries to play the contrapositive, which would be:

anti-social --> not healthy.

However, the application doesn't say that reading detracts from her social development. Instead, it states that reading merely reduces her interactions. So, the application is saying:

reduce interactions --> not healthy.

However, reducing interactions and detracting from social development are two different concepts. The author assumes otherwise, and (D) points out that flaw.

HTH

- Chris

Thanks Chris. My bad. I wrongly thought the correct answer is A and I spent like 5 minutes trying to make an explanation for A.