With the construction of Thal irrigation canal, about _____ sand dunes have been converted into highly productive cultivated areas:

A. 1 m ha
B. 2 m ha
C. 3 m ha
D. 4 m ha

The correct answer to the question: "With the construction of Thal irrigation canal, about _____ sand dunes have been converted into highly productive cultivated areas:" is "1 m ha ".