Alphabet Test — “Which letter is 10th to the left of the 18th letter from the left in the English alphabet?” (18th from left is R; move 10 left.)

Introduction / Context:
Find a base letter by left index, then shift left by a set amount (towards A).

Given Data / Assumptions:

• 18th from left = R.
• Left shift by 10 means subtract 10 from the left index.

Concept / Approach:
Compute 18 − 10 = 8 and read the 8th letter.

Step-by-Step Solution:

Verification / Alternative check:
Counting backward from R by ten steps lands on H; cross-check with A1 … H8.

Why Other Options Are Wrong:
They correspond to other offsets (e.g., J=10th, I=9th, etc.).

Common Pitfalls:
Adding instead of subtracting when moving left.

Final Answer:
H