A firm has $4$ plants A$,$ B$,$ and C can each produce $100$ widgets per day. Plant D can produce $50$ widgets per day. Each day, the widgets produced in the plants must be shipped to satisfy the demand of $3$ customers. Customer $1$ requires $75$ units per day, customer $2$ requires $100$ units per day, and customer $3$ requires $175$ units per day. The shipping costs for each possible route are shown in the table below:

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The firm would like to minimize the total costs while satisfying the demand requirement. After assessing the initial solution obtained using the North$-$West Corner method, the leaving cell is:

None of the above choices