pzazz12 wrote:The temperature dropped suddenly last night, which will mean that the shoots emerging from the soil will be killed by the frost.

A. which will mean that the shoots emerging from the soil will be killed by the frost. - which refers to last night, eliminate
B. which will mean that the frost will kill the shoots emerging from the soil. - Same as A
C. and this will mean that the shoots emerging from the soil will be killed by the frost. - 'this' does not have any reference, eliminate
D. and the resulting frost will kill the shoots that are emerging from the soil. - Best among the worst
E. and as a result, the shoots will be killed by the frost, emerging from the soil. - 'the shoots will be killed by the frost' is between commas. Actually it should be out of the commas, since it is essential part of the sentence.