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The question is based on the information provided below:

From a group of seven people – $\text{J, K, L, M, N, P}$ and $\text{Q}$ – exactly four will be selected to attend a diplomat’s retirement dinner. Selection must conform the following conditions:

1. Either $\text{J}$ or $\text{K}$ must be selected, but $\text{J}$ and $\text{K}$ cannot both be selected
2. Either $\text{N}$ or $\text{P}$ must be selected, but $\text{N}$ and $\text{P}$ cannot both be selected
3. $\text{N}$ cannot be selected unless $\text{L}$ is selected
4. $\text{Q}$ cannot be selected unless $\text{K}$ is selected

Among the people selected to attend the retirement dinner there must be

1. $\text{K}$ or $\text{Q}$ or both
2. $\text{L}$ or $\text{M}$ or both
3. $\text{N}$ or $\text{M}$ or both
4. $\text{N}$ or $\text{Q}$ or both

The answer is (B). $L$ or $M$ or both

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