A pull factor is something that attracts people to a particular region, so a large, Thus, option A is correct.
The pull factor means that the person may want to go to a particular reign or a country as it attracts that regime. they usually migrate or move from one place to another and are applied to all humans, birds, and animals.
For example, if a person finds a better job opportunity in another city, he may move there and take the job. This effect is called the pull factor.
A large deer population may move, and migrate, dull to the pull factor. There may be various reasons like coitus, good food, and weather condition. They may move from one country to another, often in heard. Therefore, option A is the correct option.
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