Which one of the following words is similar in meaning to the word, ‘readily’ (Para 1) as used in the passage ?

The correct option is easily.

Explanation:
The word ‘readily’ means doing something without hesitation, difficulty, or delay—which is synonymous with ‘easily’ or effortlessly.

Let's analyze the given options in detail:
1. Frankly: Means in an open, honest, and direct manner (e.g., speaking candidly). This does not match the meaning of 'readily'.
2. Easily: Means without difficulty or effort, which closely aligns with the meaning of 'readily'.
3. Efficiently: Means achieving maximum productivity with minimum wasted effort or expense, which relates to effectiveness rather than ease or willingness.
4. Plainly: Means clearly or simply, which refers to visibility or simplicity rather than ease of action.

Therefore, the word closest in meaning to ‘readily’ is easily.