プログラム学習・有機化学 Organic chemistry Programmed Study

The stable hydrogenation product of carbon is methane CH₄, and the valency of carbon is not 2 but 4. At this time, the carbon atom should have electron arrangement of 1s²2s¹2px¹2py¹2pz¹. Which of (a) - (c) is the structure of the methane corresponding to such electron arrangement? Consider with reference to the figure below.