Some students were shown a photomicrograph of a cross-section of an unfamiliar material and asked to state what they could observe. They described the cross-section of F as: 1 circular, 2 a hollow tube, 3 spherical. Which descriptions of the cross-section of F correctly state what the students could actually observe?
- A1, 2 and 3
- B1 and 2 only
- C1 only
- D3 only