Fill-in word chain (letter chunk completes first word and begins the second): PLAT (?) ATION Choose the chunk that forms two valid English words: the left should become a complete word ending at the chunk, and the right should start at the chunk.

Introduction / Context:
Word-chain questions ask you to select a letter chunk that simultaneously completes the word on the left and begins the word on the right, yielding two valid words with the shared chunk in the middle.

Given Data / Assumptions:

• Pattern: PLAT (?) ATION
• We need a chunk that makes a valid word to the left and to the right.

Concept / Approach:
The shared chunk must end the first word and start the second. We test each option to see if both sides become standard English words.

Step-by-Step Solution:

Verification / Alternative check:
Both resulting words should be dictionary-standard: PLATFORM and FORMATION clearly are.

Why Other Options Are Wrong:

• TENT: yields no valid pair.
• TERR: yields no valid pair.
• EAU: left word is valid (PLATEAU) but right is not.
• None of these: incorrect because FORM works.

Common Pitfalls:
Accepting a left-only or right-only valid word; both must be valid simultaneously.

Final Answer:
FORM