Correct Answer: Option A

Explanation

The shape of an s-orbital is spherical. S-orbitals are spherically symmetric, meaning that the wave function only depends on the distance from the nucleus, not the direction. The s-orbital is spherical due to its lack of angular dependence and zero angular momentum (l=0), meaning the probability of finding an electron is the same in all directions from the nucleus. 

There is an explanation video available below.

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