3. A continuación tenemos el color de ojos de los 30 alumnos de una clase: M= marrón V= verde A= azules
M V M A M A A V M M M M V M A
A V M M M V V M V M M V A M A
Haz la tabla de frecuencias del estudio.

Every number that can be expressed as a ratio of the two numbers is a rational number, and the calculation to the points can be defined  as follows:

For point A:

is not a rational.

For point B:

is a rational.

since it can be expressed as a quotient of 2 integers.

Example:

For point C:

that is a rational.

since it can be expressed as a quotient of 2 integers.

Example:

For point D:

that is not a rational.

Therefore, the answer is "Option B and Option C".

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