Read the passage below carefully, and then choose the best answer:
The Advancing Development of Artificial Limbs
It wasn’t very long ago that losing a limb automatically meant a drastic drop in the quality of a person’s life. Thanks to the wonders of modern science, people now are recovering from all sorts of horrendous injuries that let them disabled. The reason they are able to do so is remarkable advances made in the field of artificial limbs. Doctors have been creating prosthetic limbs for their patients dating back to ancient Greece. For most of history, however, these replacements were mainly for cosmetic purposes. Pirates, knights, loot soldiers that lost their limbs in battle would get them, so they wouldn’t lose face when returning to society. It wasn’t until the mid-19th century that doctors were able to perform surgeries to reliably attach limbs to people’s bodies and amputate limbs without causing serious infection. Modern artificial limbs represent a tremendous leap forward in terms of form and function. Today’s limbs are far more durable and can withstand a lot more wear and tear. An amazing example of how far artificial limbs have progressed is the Flex-Foot Cheetah. Made from carbon fiber, it is able to store energy as the person moves, which enables the wearer to run and jump. The technology is so good that approximately 90 percent of all Special Olympic amputees use them in competition. Meanwhile, the Bebionic3 has emerged as the most advanced prosthetic arm available. It has been nicknamed “The Terminator” because it is similar to Arnold Schwarzenegger’s mechanical limbs in the famous blockbuster film. The Bebionic3 can perform a multitude of tasks including writing, tying a shoelace, lifting heavy objects, and even pouring a beer. Wearers simply push a button on the base of the arm and the Bebionic3 will work its magic. In September 2013, scientists took another giant leap forward when they successfully fitted a patient with an artificial leg that can be controlled by thought. Two of the patient’s nerves were attached to his hamstring muscle. These nerves then interact with sensors inside the artificial leg. Sensors will then transmit these messages to a computer which will follow through on his instructions. Therefore, if the patient wants to stretch out his leg, the computer will understand this command and send a message to the limb and instruct it to do so. If artificial limb technology keeps advancing like this, losing a limb may not be such a big deal.
4. Which of the following best matches the meaning of the word “multitude” in paragraph 4?

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