The question asks:

Which compound will form a significant amount of meta product during mono-nitration?

However, the actual structures/options A, B, C, D are missing in the prompt. Since nitration orientation depends entirely on the substituent already present on the aromatic ring, the answer cannot be derived uniquely without seeing the compounds.

1. Principle involved

In electrophilic aromatic substitution (like nitration), substituents direct the incoming nitro group as follows:

(i) Meta-directing groups

These are generally deactivating groups that withdraw electron density strongly from the ring:

• $-NO_2$
• $-CN$
• $-SO_3H$
• $-CHO$
• $-COR$
• $-COOH$
• $-COOR$
• $-CONH_2$
• $-NR_3^+$

Such groups give predominantly meta nitration.

(ii) Ortho/para-directing groups

These include electron-donating groups and halogens:

• $-OH, -OR, -NH_2, -NHR, -NR_2$
• alkyl groups
• halogens ($-F, -Cl, -Br, -I$)

These do not give significant meta product under ordinary mono-nitration.

2. What would be the correct choice?

The correct option should be the compound containing a meta-directing substituent, typically a carbonyl-containing group, nitro group, cyano group, etc.

3. Comparison with stored answer

The stored correct answer is B. Since the actual structure of option B is not shown, I cannot independently verify it from the data provided.

If option B is the one containing a strong electron-withdrawing, meta-directing group, then the stored answer is correct.

But strictly speaking, with the options absent, the question is under-specified and cannot be solved definitively from the prompt alone.