Particle-Antiparticle Pairs Are Coming into Existence All the Time in the Space

Multiple Choice

Particle-antiparticle pairs are coming into existence all the time in the space around (and inside!) us. According to the Heisenberg uncertainty principle, the more massive the particles, the:

A) shorter the time that they can exist.
B) less precisely we know their position.
C) longer the time that they can exist.
D) more precisely we know their position.