Writing and Reading

Questions 29 and 30 refer to the following passage.
Electrons Get Around
      Whether the emptiness between stars or the emptiness between molecules, experiments have shown that upon close examination, any vacuum is not truly empty. All manner of subatomic particles—and their antimatter counterparts—constantly pop in and out of existence and annihilate each other on contact. That 
environment influences the electron; its round, negative charge is defined by the constant interaction.
      The Standard Model of particle physics, a longstanding theory describing most of the fundamental forces and particles in the universe, predicts that an electron’s charge should have a perfectly spherical shape. Many other theories—involving such concepts as "supersymmetry" and "grand unification"—posit that some undiscovered subatomic particles would be revealed if researchers were able to look closely at an electron and find that its spherical charge was slightly squashed. That would require an extreme observation, akin to measuring an Earth-sized sphere to a precision of a few atoms' thickness. As part of the Advanced Cold Molecule Electron Electric Dipole Moment Search (ACME), researchers did look that closely at the electron’s charge—and found that the sphere appeared to be perfectly round.
      29The study was funded in part by the National Science Foundation, which subsidizes approximately 24 percent of all federally supported basic research. The entire ACME team consisted of only about a dozen researchers, using an apparatus that fits in a basement room at Harvard. Within that relatively small chamber, lasers orient the molecules—and their electrons—as they soar between two charged glass plates inside a carefully controlled magnetic field. ACME researchers then watch for light the molecules emit when targeted by an additional, carefully tuned, set of readout lasers. That light reveals whether the electron’s orientation twists during flight, as would occur if it were squashed. 
      "The Standard Model makes predictions that differ radically from its alternatives, and ACME can distinguish those," noted David DeMille, who leads the ACME group at Yale. 30

Which choice provides the most effective transition into the next point?