【单选题】

It can be inferred from the passage that scientists are currently making efforts to observe which of the following events
A．The decay of a vacuum in the presence of virtual particles.

B．The decay of a vacuum next to a super heavy atomic nucleus.
C．The creation of a superheavy atomic nucleus next to an intense electric field.
D．The creation of a virtual electron and a virtual positron as a result of fluctuations of a vacuum.