Early navigation across open oceans was a ______ endeavor, as sailors lacked sophisticated instruments and were ______ to the mercy of unpredictable weather.

Answer and explanation

Correct answer: C. perilous ... subject

  1. Step 1: Analyze context clues: Lacking sophisticated instruments in unpredictable weather made journeys dangerous.
  2. Step 2: The endeavor was 'perilous' (hazardous), leaving mariners 'subject' to storms.
Answer
perilous ... subject.
Why not the others: 'tranquil ... immune' implies peaceful safety; 'routine ... resistant' denies the presence of risk; 'flawless ... vulnerable' pairs contradictory assessments.

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