Answer :

To find which number is less than 1.68, let's compare each of the given options.

We have the following numbers to consider:
- A. 1.72
- B. 1.59
- C. 1.69
- D. 1.84

Now, let's compare each option with 1.68:

1. Option A: 1.72
- 1.72 is greater than 1.68.
- So, 1.72 is not less than 1.68.

2. Option B: 1.59
- 1.59 is less than 1.68.
- So, 1.59 is a number that is less than 1.68.

3. Option C: 1.69
- 1.69 is greater than 1.68.
- So, 1.69 is not less than 1.68.

4. Option D: 1.84
- 1.84 is greater than 1.68.
- So, 1.84 is not less than 1.68.

After comparing each option, the number that is less than 1.68 is 1.59, which corresponds to option B.

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