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. You have to decide which conclusion/s logically follow's from the given statements.
Statements:

(I) Some laptops are pencils.

(II) Some pencils are rulers.

(III) All rulers are white.
Conclusion

I: Some pencils are laptops.
II: All rulers are pencils.​​

Given:

(I) Some laptops are pencils.

(II) Some pencils are rulers.

(III) All rulers are white.

From the above statement following Venn diagram will be - 

Conclusion I: "Some pencils are laptops." ( True, The first statement says that some laptops are pencils. This implies that there is at least some overlap between the sets of laptops and pencils, but it doesn't mean that any specific pencils are laptops. However, based on the first statement, we know that the set of "laptops" intersects with the set of "pencils." Hence, Conclusion I is indeed true because it logically follows that there can be pencils that are also laptops.)

Conclusion II: "All rulers are pencils." (False, The second statement says "Some pencils are rulers," which tells us there is some overlap between the set of pencils and rulers, but it doesn't imply that all rulers are pencils. Therefore, Conclusion II does not follow because the statement only mentions "some," not "all.")
Thus, the correct answer is (b) Only conclusion (I) is follow.