To evaluate the statements using rational approximations:
A. \( \sqrt{49} < 7 \)
- This is false because \( \sqrt{49} = 7 \).
B. \( \sqrt{48} > \sqrt{36} \)
- \( \sqrt{48} \) is approximately \( 6.93 \) and \( \sqrt{36} = 6 \). This is true since \( 6.93 > 6 \).
C. \( \sqrt{48} < \sqrt{36} \)
- This is false, as established in option B.
D. \( \sqrt{49} > 7 \)
- This is false because \( \sqrt{49} = 7 \).
From these evaluations, the true statement is:
B. \( \sqrt{48} > \sqrt{36} \).