In the following passage, there are blanks, each of which has been denoted by a letter. For each blank, five options are given. Choose the most appropriate word from the options that fits the blank appropriately.

The controlled use of fire represents one of humanity's most ______ (A) technological breakthroughs. Anthropologists believe our ancestors first ______ (B) fire naturally caused by lightning strikes or volcanic activity. This accidental discovery eventually led to the ______ (C) of techniques for creating and maintaining flames.

Early humans likely noticed how wildfires ______ (D) their environment, both frightening and fascinating them. The first intentional use of fire for warmth and protection marked a ______ (E) moment in human evolution. Over millennia, our ancestors developed increasingly sophisticated methods to ______ (F) this powerful element, fundamentally changing the course of civilization.

Which of the following words will fit in the given blank (A).

The correct answer is seminal.

Step-by-step explanation:

1. Analyze the context: The sentence discusses "the controlled use of fire" and describes it as "one of humanity's most ______ technological breakthroughs." Controlling fire is historically recognized as one of the most critical, influential, and transformative developments in human history, which indicates the blank requires an adjective that denotes great significance and influence.

2. Define the options:
• Seminal: (Adjective) Strongly influencing later developments; groundbreaking, highly influential, or pioneering. This fits the context perfectly, as the control of fire laid the foundation for cooking, warmth, protection, and metallurgy.
• Trivial: (Adjective) Of little value or importance. This contradicts the monumental nature of controlling fire.
• Negligible: (Adjective) So small or unimportant as to be not worth considering; insignificant. This is the opposite of what is needed.
• Redundant: (Adjective) No longer needed or useful; superfluous. This does not make sense in describing the breakthrough.

3. Conclusion: "Seminal" is the only word that correctly conveys the groundbreaking and highly influential nature of the controlled use of fire in human history.