Final answer:
B. Tetrahedral, nonpolar
The structure of methane (CH4) is tetrahedral, and due to its symmetrical shape, it is a nonpolar molecule.
Step-by-step explanation:
The structure of methane, CH4, is tetrahedral with a central carbon atom (C) bonded to four hydrogen atoms (H). The hydrogen atoms are situated at the corners of a tetrahedron, with the carbon atom at the center.
This spatial arrangement causes the hydrogen atoms to be as far apart as possible, leading to a bond angle of 109.5° between them. Due to the symmetrical distribution of the hydrogen atoms around the carbon atom, methane is a nonpolar molecule.
Therefore, the correct answer to whether methane is polar or nonpolar and its geometric structure is option B: Tetrahedral, nonpolar.