2. Karl found some valuable stones in a cave: each 5-pound stone is worth 14 yuan, each 4-pound stone is worth 11 yuan, and each 1-pound stone is worth 2 yuan. It is known that there are at least 20 of each type of stone, and Karl can take out a total of 18 pounds of stones from the cave. Then the maximum value of the stones taken out is ( ) yuan.
(A) 48
(B) 49
(C) 50
(D) 51
(E) 52
2. C.
$$
14 \times 2+11 \times 2=50 \text{. }
$$