A comprehension question-Please help!

1b00"On 31 October 1994, a turboprop airliner heading for Chicago, Illinois, crashed into a soybean field at Roselawn in Indiana. All 68 people aboard died. Although the weather was cold and damp that day, no one could believe it when investigators revealed that the crash was caused by a build-up of ice on the wings. Not only did this modern plane have a fully functional de-icing system, but according to US Federal Aviation Administration (FAA) standards, the French-built ATR-72 should have had no problems flying in the cold, damp conditions. The pilots even knew their craft was icing up and attempted to clear it, following de-icing procedures exactly."02b02br
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01b00According to the passage, when the pilots realized the craft had encountered Icing ----.02b02br
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01b00A)02b00 they were nevertheless confident that their turboprop airliner was not in danger02br
01b00B)02b00 00they decided to make an emergency landing02br
01b00C)02b00 00it was already too late for them to do anything about it02br
01b00D)02b00 00they also realized that their de-icing system was not fully functional02br
01b00E)02b00 00they immediately carried out the instructions for de-icing with great precision02br
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00It seems the answer is "E", but I wonder the counterpart of the meaning of the option in the passage: Does the passage say exactly "yes, the pilots did what the option "E" offers" ? If so, how? How can we infer from the passage they did? Who says? Didn't all 68 people aboard die? Is another option, such as "A", possible?02br
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00Any comment'll be much appreciated! Thanks in advance.05002br
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