Explanation:

To find the area of the canvas required to cover the heap of wheat, which is in the shape of a cone, we need to calculate the lateral surface area of the cone.

- Given:

- Base diameter of the cone = 8.4 meters, so the radius (r) is 8.4/2 = 4.2 meters.

- Height (h) of the cone = 1.75 meters.

- Formula:

- The lateral surface area (A) of a cone is given by the formula:

$A=\pi \cdot r\cdot l$

- Where $l$ is the slant height of the cone, found using the Pythagorean theorem:

$l=\sqrt{r^2+h^2}=\sqrt{{4.2}^2+{1.75}^2}$.

- Calculations:

- Calculate $l$:

$l=\sqrt{{4.2}^2+{1.75}^2}=\sqrt{17.64+3.0625}=\sqrt{20.7025}\approx 4.55$ meters.

- Using the formula for lateral surface area:

$A=\frac{22}{7}\cdot 4.2\cdot 4.55\approx 60.06{\text{m}}^2$.

- Conclusion:

- Among the options, the correct answer is Option 1: 60.06 m².