A mountain bike type bicycle has a chainring with 3 gears and a cassette with 6 gears, which, combined with each other, determine 18 speeds (number of chainring gears times the number of cassette gears).
The number of teeth of the gears on the chainrings and cassettes of this bicycle are listed in the table.
| Gears | $\mathbf{1}^{\mathrm{st}}$ | $\mathbf{2}^{\mathrm{nd}}$ | $\mathbf{3}^{\mathrm{rd}}$ | $\mathbf{4}^{\mathrm{th}}$ | $\mathbf{5}^{\mathrm{th}}$ | $\mathbf{6}^{\mathrm{th}}$ |
| \begin{tabular}{ c } Number of teeth on |
| chainring |
& 46 & 36 & 26 & - & - & - \hline
| Number of teeth on |
| cassette |
& 24 & 22 & 20 & 18 & 16 & 14 \hline \end{tabular}
It is known that the number of rotations made by the rear wheel with each pedal stroke is calculated by dividing the number of teeth on the chainring by the number of teeth on the cassette.
During a ride on a bicycle of this type, one wishes to make a route as slowly as possible, choosing for this one of the following gear combinations (chainring x cassette):
| $\mathbf{I}$ | II | III | IV | V |
| $1^{\mathrm{st}} \times 1^{\mathrm{st}}$ | $1^{\mathrm{st}} \times 6^{\mathrm{th}}$ | $2^{\mathrm{nd}} \times 4^{\mathrm{th}}$ | $3^{\mathrm{rd}} \times 1^{\mathrm{st}}$ | $3^{\mathrm{rd}} \times 6^{\mathrm{th}}$ |
The combination chosen to perform this ride in the desired way is
(A) I.
(B) II.
(C) III.
(D) IV.
(E) V.