According to the vsepr model, the arrangement of electron pairs around nh3 and ch4 is a. the same, because in each case there are the same number of electron pairs around the central atom b. different or the same, depending on the conditions leading to maximum repulsion c. different, because in each case there are a different number of atoms around the central atom d. the same, because both nitrogen and carbon are both in the second period e. different, because in each case there are a different number of electron pairs around the central atom

Option "B" is correct.

Explanation:

According to VSEPR theory, There are repulsion forces exists among the bond pair - bond pair or bond pair - lone pair of electrons. In and  , the number of electron pairs are same but methane has all the four bond pairs where in ammonia, three bond pairs and one lone pair exists. And thus there are repulsion forces possible in between the lone pair and bond pair of electrons thus the arrangement of electron pairs around both the molecules is same or different depending up on the conditions leading to maximum repulsion.  

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be