Which best describes the Clusters in the data set number of ripe tomatoes on each plant in the nursery

Not sure help please

There are two clusters at 13 and at 15

Step-by-step explanation:

In the data, the number of ripe tomatoes keeps increasing slowly from 10 to 13, (1, 1, 4, 5). Seeing this pattern, it seems we have a peak at 13. The value of 14 is the same as 12, which is 4.  If there is only one cluster, we expect the data at 15 is equal to 11 which is 1.  

But at 15 the number increases instead of decrease, it becomes 6 instead of 1.  We can expect that there is another cluster/peak that drive the number up.