Explanation : Assuming the question as per the attachment; the answer is option D; which has a positive charge in a cell.
The molecule of methylamine which has N as the central molecule which is the substituted group of [tex] NH_{2} [/tex] when dipped in the cell becomes polar in nature and produces positive and negative ions in the cell. The [tex] CH_{3} [/tex] will have C as the central atom and it will produce polar ends between C and N elements which will generate positive charge in the cell.
