The ends of a string weighing w/metre are attached to two points at the same horizontal level. If the central dip is very small, the horizontal tension of the string throughout is

• A. <img src="/_files/images/civil-engineering/applied-mechanics/116-5.225-1.png">
• B. <img src="/_files/images/civil-engineering/applied-mechanics/116-5.225-2.png">
• C. <img src="/_files/images/civil-engineering/applied-mechanics/116-5.225-3.png">
• D. <img src="/_files/images/civil-engineering/applied-mechanics/116-5.225-4.png">