Find the odd number / letters / word from the given alternative:

The answer is B. ONP.

The other three options, A, C, and D, are all consonant clusters. A consonant cluster is a group of two or more consonants that come together in a word. In these three options, the consonants are all adjacent to each other. For example, in the word “STR,” the consonants “S” and “T” are adjacent to each other, and the consonants “T” and “R” are adjacent to each other.

In the option B, ONP, the consonants “O” and “N” are not adjacent to each other. The consonant “P” is in between them. This makes it the odd one out.