According to the passage about the Siddiqui family in Karachi, what was the biggest source of wasted water they discovered?
Read the passage: During a long summer water shortage in Karachi, the Siddiqui family decided to track how much water they used. Bilal, the eldest son, fixed a small meter to the tank and recorded the readings every evening. The family discovered that a leaking toilet cistern was wasting more water than all their cooking put together. After a plumber repaired it, their daily use fell by almost a fifth. They also began collecting the water used to rinse vegetables and pouring it on the potted plants on their balcony. Bilal's younger sister made a chart for the kitchen wall showing each day's figure, and the family now treats beating the previous week's total as a friendly challenge.
Correct answer D. A leaking toilet cistern
The family found that a leaking toilet cistern was wasting more water than all their cooking put together, and repairing it cut their use by almost a fifth.
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