Read the following paragraph from the section "The Battle Of San Jacinto."
On April 21, some 500 reinforcements arrived in the Mexican camp, raising troop strength to about 1,300. When Houston didn't attack at first light, Santa Anna assumed there would be no battle that day. The Mexicans relaxed and rested. At about 3:30, though, the force of 900 Texians began marching forward as quietly as possible, trying to get close before opening fire.

What conclusion is BEST supported by this paragraph?
A. Santa Anna let his troops sleep early because he believed that Houston was planning to attack later that night.
B. Having rest and relaxation enabled the Mexican troops to fight more successfully when the Texians attacked.
C. Houston decided not to attack at first light because he was worried about losing to the reinforced Mexican army.
D. Surprising the Mexicans was a necessary and successful strategy to help the outnumbered Texians win the battle.