Statement–Assumption — “Mother tongue is undoubtedly the most facile (easiest) language for children to learn in early schooling.” Assumptions: I. Learning in other languages imposes extra strain on the minds of early-school children. II. After maturing, students can learn effectively in other languages as well.

Introduction / Context:
The statement asserts that the mother tongue is the easiest language for early schooling. Such a comparative claim (“most facile”) usually presumes that alternatives are harder at that stage, thereby imposing added effort or cognitive load.

Given Data / Assumptions:

• Children begin schooling with a language already used at home (mother tongue).
• “Most facile” implies a comparison against non-native/second languages during early years.

Concept / Approach:
To justify “most facile,” the minimal assumption is that learning via other languages is comparatively more demanding for young children. However, nothing in the statement requires a claim about later stages of life.

Step-by-Step Solution:
1) Assumption I: If other languages did not create extra demand or strain relative to the mother tongue, the superlative “most facile” would lack support. Thus I is implicit.2) Assumption II: The statement is silent about later schooling; children may or may not learn other languages later. The present claim concerns the early phase only, so II is not necessary.

Verification / Alternative check:
Education policy debates often cite early literacy advantages in a familiar language; such arguments do not hinge on what happens in higher grades.

Why Other Options Are Wrong:
II-only/Either/Both/Neither either exclude the essential comparative premise or add an unnecessary future-learning claim.

Common Pitfalls:
Reading an early-years claim as a life-long prescription; assuming the statement must also address later multilingual education.

Final Answer:
if only assumption I is implicit.