Final answer:
The reasonable length for a ping pong table is a) 36 cm.
Step-by-step explanation:
The reasonable length for a ping pong table would be a) 36 cm.
The standard size of a ping pong table is 9 feet by 5 feet, which is equivalent to approximately 274 cm by 152 cm. This is the size used in professional tournaments and is the most common size for recreational play as well.
Option a) 36 cm is a reasonable length for a smaller, mini ping pong table that can be used for children or smaller spaces. The other options, b) 42 in, c) 58 g, and d) 72 in, do not fall within the standard dimensions of a ping pong table.