The length of the simple pendulum which ticks seconds is:

Tick second is 2 seconds in meaning. Recall the principles and equations for a basic pendulum. To comprehend a basic pendulum like a bob tightened at one end of thread, think about instances from daily life.

A weight hanging from a table such that it may freely swing is called a pendulum.
To answer the question, we must first comprehend what it is trying to tell us, then determine what calculation is required.
It will be simple for us to answer the question if we are aware of these two facts.
The word "ticks" in the question indicates that a basic pendulum has a period of 2 seconds.

i.e. T = 2 seconds —————- (1)
The simple pendulum formula is provided by,

$T=2\pi \frac{\sqrt{l}}{\sqrt{g}}$

Where,
T is the time period of simple pendulum
l is the length of thread or wire or string
g is the acceleration due to gravity
Put value of equation one in above equation, we get

$2=2\pi \sqrt{\frac{l}{g}}$

To solve further, square on both sides
We get,

$4=4{\pi }^2\times \left(\frac{l}{g}\right)$
Rearrange the equation,
$l=\frac{g}{{\pi }^2}$
$l=\frac{9.8}{{\pi }^2}$

$l=0.99 m$
Which is approximately equal to $1 \mathrm{m}$

Correct answer is option B) 1m