The figure shows the incomplete schematic of a conventional lathe to be used for cutting threads with different pitches. The speed gear box Uv is shown and the feed gear box Us is to be placed. P, Q, R and S denote locations and have no other significance. Changes in Uv should NOT affect the pitch of the thread being cut and changes in Us should NOT affect the cutting speed.The correct connections and the correct placement of Us are given by

• A. Q and E are connected. Us is placed between P and Q.
• B. S and E are connected. Us is placed between R and S.
• C. Q and E are connected. Us is placed between Q and E.
• D. S and E are connected. Us is placed between S and E.