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Math·Problem-Solving and Data Analysis·Probability and conditional probability

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Subject	Sixth	Seventh	Eighth	Total
English	4	8	10	22
Mathematics	8	3	9	20
Science	4	6	4	14
Social studies	6	10	8	24
Total	22	27	31	80

The table gives the distribution of favorite core subject and grade level for 80 students.

If a student is selected at random, what is the probability of selecting a student whose favorite core subject is mathematics?

A

$\frac{1}{8}$

B

$\frac{1}{5}$

C

$\frac{1}{4}$

D

$\frac{31}{80}$