Final answer:
The average length of time a condemned person spends on death row can vary and there is no definitive average. The options provided are not representative of the average time.
Step-by-step explanation:
The average length of time a condemned person spends on death row can vary depending on various factors, including the legal process, appeals, and individual circumstances of the case. However, it is important to note that there is no definitive average length of time. Some condemned individuals may spend just a few years on death row, while others may spend several decades. Therefore, none of the options provided (a) 1 year, (b) 5 years, (c) 10 years, (d) 20 years) can be considered representative of the average time spent on death row.