Sonika is working with the circuit shown in the following figure:

The circuit has two gaps: X and y. She has wires of five different materials - I, II, III, IV and V. She knows that the bulb will light up only when both gaps are filled with conducting materials.
She records her observations in a table. After completing the experiment, ink fell on the paper and she lost entries in row 3.

Based on the rest of the information in the table, out of the following what could be the materials in row 3?

Options

A. II and III
B. III and IV
C. IV and V
D. I and III

Answer

A

Explanation

The entries in rows 2 and 4 show that I: conducting material, IV: conducting material, Ill: conducting material, V: conducting material,
This information, combined with the entries in row 1, shows that
II : Non-conducting material
`:.` Row 3 must include II.