Which is a counterexample to this conjecture?

the sum of any two consecutive integers is a composite number.

a.
16 + 17 = 33 b.10 + 11 = 21 c.6 + 7 = 13 d.7 + 8 = 15

Given the following statements, which is the best

In what organelle does photosynthesis take place?

The test scores of 32 students are listed below. construct a boxplot for the data set and include the values of the 5-number summary. 32 37 41 44 46 48 53 55 57 57 59 63 65 66 68 69 70 71 74 74 75 77 78 79 81 82 83 86 89 92 95 99