Question

2. "Regular aerobic exercise gives an individual more endurance" is a sentence that shows cause and effect. Which word indicates the cause?

Answer 1

The answer is gives.

Hope I could help!

Answer 2

I believe the answer is Exercise.

From the sentence above, we know that the desired effect is "gives an individual more endurance" which leave us with these three words:
Regular
aerobic
exercise

From those three options, exercise is the one that directly correlated with the result of endurance itself (it still couldn't be achieved eventhough the exercise is irregular or non-aerobic)