Thank you for the opportunity to help you with your question!

We use the Pythagorean Theorem.

a^2 + b^2=c^2

let c be our hypotenuse

DA=square root of (BD^2 + AB^2)

=square root(2.4 ^ 2 + 1.0 ^ 2)

=square root(5.76 +1)

=2.6

The answer is D.

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