Siblings — How many sisters does K have? Statements: I. M is a sister of K. II. K’s mother has three children.

Introduction / Context:We need the exact count of K's sisters from family-size and one-known-sister facts.

Given Data / Assumptions:

• I: K has at least one sister (M).
• II: Total children of K’s mother = 3 (includes K).

Concept / Approach:Enumerate possibilities for the third child’s gender.

Step-by-Step Solution:

Verification / Alternative check:Case A: (K male), siblings = {M (F), X (M)} → 1 sister. Case B: (K male), siblings = {M (F), X (F)} → 2 sisters. Both obey I & II.

Why Other Options Are Wrong:

• A/B/C/E: Neither statement alone suffices; even together they do not fix a unique number.

Common Pitfalls:Assuming genders not stated; presuming K’s own gender.

Final Answer:D — Together not sufficient.