AMC 12B 2020 Problem 1

Past Contests AMC 12 AMC 12B - 2020
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1

What is the value in simplest form of the following expression?

\sqrt{1}+\sqrt{1+3}+\sqrt{1+3+5}+\sqrt{1+3+5+7}

Answer Choices
A. 5
B. 4+\sqrt{7}+\sqrt{10}
C. 10
D. 15
E. 4+3 \sqrt{3}+2 \sqrt{5}+\sqrt{7}