The given word is "NOT". We need to find out how many meaningful English words can be formed using any two letters of this word.

To solve this problem, let's break it down into steps:

Step 1: Identify the possible combinations
Since we are forming words using any two letters of the word "NOT", there are a total of 3 letters to choose from. Therefore, the number of possible combinations can be calculated using the formula for combinations of 'n' items taken 'r' at a time, which is given by nCr = n! / (r!(n-r)!).

In this case, we need to find the number of combinations of 3 items taken 2 at a time, which can be calculated as 3C2 = 3! / (2!(3-2)!) = 3.

Step 2: Forming meaningful words
Now, let's try to form meaningful English words using each of these combinations:

Combination 1: "NO"
Some meaningful words that can be formed using the letters "NO" are "ON" and "NO". Both of these words are valid English words.

Combination 2: "NT"
Some meaningful words that can be formed using the letters "NT" are "TN" and "NT". Both of these words are valid English words.

Combination 3: "OT"
Some meaningful words that can be formed using the letters "OT" are "TO" and "OT". Both of these words are valid English words.

Step 3: Counting the meaningful words
By analyzing the combinations, we can see that there are a total of 2 meaningful words that can be formed using each combination. Since we have 3 combinations, we can multiply the number of combinations by the number of meaningful words formed from each combination to get the total number of meaningful words.

Total number of meaningful words = Number of combinations * Number of meaningful words per combination = 3 * 2 = 6.

Therefore, the correct answer is option B) Three meaningful English words can be formed by using any two letters of the word "NOT".