'Hour' is related to 'Second' as a larger unit to a much smaller sub-unit of time. In the same way, 'Tertiary' is related to which education level below it?

Introduction / Context:
This analogy compares hierarchical scales. “Hour : Second” represents a much larger time unit mapped to a much smaller sub-unit (two levels down from hour → minute → second). We must map academic levels similarly for “Tertiary : ?”.

Given Data / Assumptions:

• Hour is a higher unit; second is a much smaller unit.
• Education levels, simplified: primary → secondary → tertiary.
• We mirror “far smaller/earlier level” relative to tertiary.

Concept / Approach:
Since hour to second skips one intermediate level (minute), tertiary to primary similarly skips one (secondary) to land at the much “lower/earlier” level. Thus, “tertiary : primary” mirrors the step-drop magnitude shown by “hour : second”.

Step-by-Step Solution:

Verification / Alternative check:
If we only dropped one level, we would get “secondary”, which would mirror hour → minute, not hour → second. Because the stem uses “second”, we replicate the two-level gap → “primary”.

Why Other Options Are Wrong:

• Secondary: Only one step down; the stem implies two levels apart.
• Ordinary / Intermediary / Graduate: Not precise tiers in the standard primary–secondary–tertiary ladder.

Common Pitfalls:
Matching hour → minute rather than hour → second, thereby choosing “secondary” instead of the correct “primary”.

Final Answer:
Primary