altius free FL #14

[akimhaneul]

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I am confused about this question. Why can't it be A?

 

[Brawndo2016]

It is an open channel. No top, per se. If the channel were completely enclosed then choice A would be correct.

 

[akimhaneul]

When they say open channel, do they mean something like this? basically no lid on top?

 

[Brawndo2016]

Yes