he crash in the Alps has launched

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A. The crash in the Alps has launched a search for a solution to the problem of accessing the cockpit from outside if the plane has been commandeered from within.

B. Flight safety has so far focused on threats from the passenger side, and the 9/11 terror episode led to fortification of the cockpit.

C. But if they are in a position to act, pilots can override this mechanism.

D. In exceptional circumstances, such as an emergency affecting the pilot and the cockpit area, the crew can use a code that opens the cockpit door briefly, or it even opens automatically if the pilots are immobilized due to depressurization.

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At the outset, both sentences A and B seem to offer a good choice to start the paragraph.

Sentence C states that if they are in a position to act, pilots can override “this mechanism?. What can the mechanism refer to? The obvious answer is the code that opens the cockpit door discussed in sentence D. So C follows D.

Sentence D refers to exceptional circumstances when access to the cockpit can be obtained. Both situations discussed to here assume that the cockpit is no longer commandeered from within- i.e when the emergency affects the pilot or cockpit area, the crew can use a code to gain access. When the pilots are immobilized, the doors open automatically.

Sentence A refers to the search for a solution to the problem of access to the cockpit when the plane is still commandeered from within.

So A follows D.

However, we also know that C follows D. Considering sentences A and C, it is clear C is a better choice to immediately follow D than A, as it refers to the mechanism of overriding access to the cockpit.

Consider sentence B. This talks of flight safety efforts being focused on threats from the passenger side, leading to fortification of the cockpit. Sentence D talks of the exceptional circumstances when the fortified cockpit can be accessed. So D follows B.

The question is " Arrange the sentences in the correct order "

The order is BDCA

Hence, the answer is BDCA

Choice D is the correct answer.

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