The repetition of the stage direction "Silence" at the end of the passage serves which main purpose?

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Gilman's the yellow wallpaper expresses the idea that doctors in the 19th century did not take into account the opinions and needs of mentally ill patients when treating them which line from they story best supports this theme

As a representative of a pharmaceutical company, you have been asked to speak to a group of physicians at a medical conference to introduce a new drug. when discussing how the drug works, which strategy is not appropriate?

1. in which sentence is the underlined portion a predicate nominative? for astronauts, going into space to repair orbiting equipment becomes a challenge. for astronauts, going into space to repair orbiting equipment becomes tricky. for astronauts, going into space to repair orbiting equipment becomes challenging. for astronauts, going into space to repair orbiting equipment becomes frequent.