Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.
Statements:
I. No hills are mountains.
II. Some mountains are valleys.
III. All valleys are glaciers.
Conclusions:
(I) No hills are valleys.
(II) Some mountains are glaciers.

​Statements:
I. No hills are mountains.
II. Some mountains are valleys.
III. All valleys are glaciers.

​Conclusions:

(I) No hills are valleys. (Not follow, because there is no any direct relation between hill and valleys)
(II) Some mountains are glaciers. (Follow, because Some mountains are valleys  All valleys are glaciers.)

So, Only conclusion (II) follows.

Thus, correct option is (c).