Meaning of "Striking distance"

[Dixi]

English Language Tests, Intermediate level

ESL/EFL Test #811 "Lions: Vocabulary Practice (3)", question 10

When lionesses hunt together, they usually encircle their prey and creep up together until they get within a suitable striking ..........

(a) quarry
(b) dig
(c) hunter
(d) distance

English Language Tests, Intermediate level

ESL/EFL Test #811 "Lions: Vocabulary Practice (3)", answer 10

When lionesses hunt together, they usually encircle their prey and creep up together until they get within a suitable striking distance.

Correct answer: (d) distance

Your answer was: incorrect
When lionesses hunt together, they usually encircle their prey and creep up together until they get within a suitable striking hunter.
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what is the meanning distance in this context?

Dixi

[Linda]

Hello,
"Striking distance" is the distance that it takes to obtain or reach something such as a goal or, in this case, an unsuspecting victim.
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[Puppet]

Hi Linda,

You don't mind if i ask you to explain it some more?

What's the addition that 'striking' could give if we put it altogether with the the word of 'distance'?

[Mister Micawber]

It shows the relevance of the distance to the activity: striking distance-- the distance within which one can strike; spitting distance-- the distance within which one can spit; shouting distance-- the distance within which one's shout can be heard; etc.
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Native English teacher at Mister Micawber's

[Puppet]

Mr. Micawber, I do appreciate that to you.

I got the picture so well.