Olaf has 30 tokens for the Huntsville Halloween Faire. Milkshakes cost 3 tokens and tickets to the Haunted House cost 2 tokens.

His value for milkshakes is $2 times the square root of the number of milkshakes.

His value for tickets is $7 - ($3 / number of tickets).

How many milkshakes and tickets should Olaf purchase?

A. 1 shake and 5 tickets

B. 1 shake and 7 tickets

C. 4 shakes and 3 ticket

D. 4 shakes and 2 tickets

E. 12 shakes and 1 ticket