Read the given statements and conclusions carefully. You have to take the given statements to be true even if they seem to be at variance from commonly known facts and decide which conclusion(s) logically follow(s) from the given statements.
Statements:
(1) All oil is paint.
(2) All paint is brush.
Conclusions:
(I) Some brushes are oil.
(II) No brush is oil.

​Statements:
(1) All oil is paint.
(2) All paint is brush.

According to the given statements, Venn diagram will be:

Let's analyze the conclusions:

Conclusion (I): Some brushes are oil.  (True)
If all oil is brush, then obviously some part of the brush category contains oil. So, this is logically correct.
Conclusion (II): No brush is oil.   (False)
If all oil is brush, then at least some brushes are oil. So, this is logically incorrect.
Thus, the correct option is (d) Only conclusion (I) follows.
​​​