Final answer:
The Battle of the Alamo was the event in Texas history where all Texan defenders were killed after a 90-minute attack, which later became a motivational war cry in the subsequent Battle of San Jacinto. Option B is the correct answer.
Step-by-step explanation:
The battle in Texas history that resulted in the death of all Texan defenders after a 90-minute attack, serving as a rallying cry for revolution despite ending in a Texan defeat, was the Battle of the Alamo. This significant event occurred in late February of 1836 when General Antonio López de Santa Anna's troops prevailed over the Texan defenders after a siege and an intense battle. Notable figures such as Davy Crockett and Jim Bowie were among the defenders who died at the Alamo. Despite the defeat, the cry "Remember the Alamo!" later inspired the Texans to achieve victory at the Battle of San Jacinto, securing Texas' independence from Mexico.