Select the most appropriate option to fill in the blank.

APJ Abdul Kalam's house, located on Mosque Street was within the reach of the famous temple of Rameswaram. It was just ________ from it.

a stone's throw away

The most appropriate option to fill in the blank is a stone's throw away.

The idiom "a stone's throw away" means "very close" or "within easy reach". It is the most appropriate option in this context because it conveys the idea of how close APJ Abdul Kalam's house was to the famous temple of Rameswaram.

The other options do not make sense in the context of the sentence.

• "At one's fingertip" means something that is very easy to get or to do. It does not make sense to say that APJ Abdul Kalam's house was at one's fingertip from the temple.
• "At arm's length" means something that is kept at a distance. It does not make sense to say that APJ Abdul Kalam's house was at arm's length from the temple.
• "From pillar to post" means to go from one place to another in a hurry. It does not make sense to say that APJ Abdul Kalam's house was from pillar to post from the temple.