ANSWER:
Crusades, military expeditions, beginning in the late 11th century, that were organized by western European Christians in response to centuries of Muslim wars of expansion. Their objectives were to check the spread of Islam, to retake control of the Holy Land in the eastern Mediterranean, to conquer pagan areas, and to recapture formerly Christian territories;
Your A and B are the same, so I assume you messed up there.
But the 26th amendment granted the right to vote to American citizens aged eighteen or older, or 18+.
Answer
Virtual realism lost much of its appeal due to the difficulty in creating lifelike images.
Explanation
Virtual reality is a high-end user interface which involves real-time simulation and interaction through multiple sensational channels. Sound, vision, taste ,smell and touch are the five senses that are used in virtual reality.
It has set of independent rotations that completely specifies the position and the orientation of the system. Or an environment that can be interacted with seemingly real or physical way by somebody using special electronic equipment's such as 3D screens.
answer: Number 2. is either a or b because he faced many challenges during his expedition.
