What is the geometry of ammonia molecule?

Pyramidal 

The correct answer is option 3. Pyramidal.

The geometry of the ammonia molecule (\(NH_3\)) is pyramidal. In ammonia, the nitrogen atom has three bonded hydrogen atoms and one lone pair of electrons. This lone pair of electrons occupies more space than the bonding pairs, resulting in a distorted tetrahedral geometry with the nitrogen atom at the apex and the three hydrogen atoms forming a triangular base. The bond angles in ammonia are approximately 107 degrees, which deviates slightly from the ideal tetrahedral angle of 109.5 degrees due to the lone pair causing greater repulsion than bonding pairs. So, the correct answer is: Pyramidal