<h2>Explanation:</h2><h2></h2>
Here we need to simplify the square root of ten times square root of eight, so let's write this step by step:
Step 1. The square root of ten
Step 2. The square root of eight
Step 3. The square root of ten times square root of eight
Finally, the correct option is:
<em>Four square root of five</em>
