Nhận biết (M1)

Dermatological researchers and geneticists make regular use of representative cross-sections of hair fibers, but such a cross-section can be obtained only if the strand can be cut perpendicular to its length without distorting the cross-sectional shape, which necessitates embedding the hair in a stabilizing medium, often resin, before sectioning it. Resin is effective but slow due to its long curing time, which led Tina Lasisi and colleagues to try sheets of low-melt-point plastic as a stabilizer. They found that these sheets match resin’s utility as a stabilizer while allowing for near-instantaneous embedding of hair, thereby demonstrating that using low-melt-point plastic sheeting rather than resin can enhance __________

Which choice most logically completes the text?

• A.

  an embedded hair’s cross-sectional shape without reducing the researchers’ likelihood of obtaining perpendicular cuts.

• B.

  the efficiency of preparatory steps before sectioning a hair without compromising the hair’s cross-sectional shape.

• C.

  the rate at which hairs can be embedded before sectioning because no stabilizing agent is used.

• D.

  the researchers’ likelihood of obtaining perpendicular cuts while simplifying the process of preparing a hair for sectioning.