The table below shows a consumer's total utility (in utils) derived from consuming successive glasses of premium lemonade on a hot afternoon.
| Glass of Lemonade | Total Utility (utils) |
|---|---|
| 1 | 25 |
| 2 | 55 |
| 3 | 90 |
| 4 | 130 |
| 5 | 165 |
| 6 | 190 |
| 7 | 205 |
| 8 | 212 |
At which glass of lemonade does the consumer begin to experience diminishing marginal utility?
4th glass
5th glass
6th glass
7th glass
