Hey there,
Your question states: Which are partial products for 28 space cross times space 43? Based on what I see from your options above. I noticed on how they hardly make sense, well, there hard to understand. But when doing the math, I see how 20 space cross times space 4 space equals space 80 would be the correct answer. By looking at the other options, they seem either to (far) from the digits 28;43. You would want for it to be in the range if those 2 numbers, if you understand. But as seeing the options above, 20 space cross times space 4 space equals space 80 would make more sense then the other options listed above.
I hope this helps, and hopefully is the answer your looking for. (correct me if wrong)
~Jurgen