English Language · Cloze Test

In the following passage, some words have been omitted. Read the passage carefully and select the most appropriate word to fill in blank (A). Life-extension endeavours are already here. Several companies now offer cryogenic freezing to people who wish to have their dead bodies cooled with liquid nitrogen and stored for centuries, with the hope that new medical technologies will by then be available to (A) them. A British teenager who sued for the right to be cryogenically frozen after her death from cancer now floats in frosty slumber in a Michigan cryostat facility. Meanwhile, scientists in California are expected to begin a clinical trial in which participants will have their blood 'cleaned' of age-related proteins, with the goal of helping them live longer and healthier lives. Which of the following words can fill in the blank A?