How do foraminifera found in rock layers above the k-t boundary compare to those in rock layers below?

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Foraminifera above the boundary are larger and more diverse than those below.
Foraminifera above the boundary are larger and less diverse than those below.
Foraminifera above the boundary are smaller and more diverse than those below.
Foraminifera above the boundary are smaller and less diverse than those below

The answer is Foraminifera above the boundary are smaller and less diverse than those below

What kind of enegia produces the mixture of bicarbonate and vinegar  chemical producetion