Direction: Select the related word/letters/number from the given alternatives.…

Concept: In a number-based analogy of the form A : B :: C : D, first identify the single arithmetic operation that turns A into B, then apply the very same operation to C to obtain D.

1. Split the first number, 37, into its two digits: 3 and 7.

2. Multiply these digits: 3 × 7 = 21, which matches the second number in the pair — so the operating rule is digit multiplication.

3. Apply the same rule to the second pair's first number, 29: split it into its digits, 2 and 9.

4. Multiply these digits: 2 × 9 = 18.

Cross-check: Among the given options — 17, 28, 18, and 19 — only 18 equals the product of 29's two digits (2 × 9), confirming it as the correctly related number.