The reaction image/details are missing in the prompt, so the exact substrate and reagents are not visible. However, from the options given, the products listed are the two possible butenes:

• Option C: $\mathrm{CH_3-CH=CH-CH_3}$ = but-2-ene
• Option D: $\mathrm{CH_3-CH_2-CH=CH_2}$ = but-1-ene

Since this question is from alcohols, phenols and ethers, such questions commonly ask for the alkene formed on dehydration of a butyl alcohol.

Step 1: Apply the general rule for dehydration of alcohols

On acid-catalyzed dehydration of alcohols, the major product is generally the more substituted alkene according to Saytzeff (Zaitsev) rule.

Thus, among the two possible butenes:

• $\mathrm{but\text{-}2\text{-}ene}$ is more substituted
• $\mathrm{but\text{-}1\text{-}ene}$ is less substituted

So the expected major product is:

$\mathrm{CH_3-CH=CH-CH_3}$

which is Option C.

Step 2: Compare with stored answer

The stored correct answer is given as B, but the visible options only show structures for C and D, and among those, the chemically expected product is C.

Therefore, I do not agree with the stored answer.

It is possible that the original image/reaction or full option list is incomplete in the prompt, and option B may have contained another structure not shown here. Based only on the visible information, Option C is the correct choice.