The correct answer is option 4, which states that the cultivation of wheat requires moderate temperature and moderate rains.

Option 1, which suggests moderate temperature and heavy rains, is not ideal for wheat cultivation as heavy rainfall can lead to excessive waterlogging and adversely affect the wheat crop.

Option 2, which states humid temperature and heavy rains, is also not suitable for wheat cultivation as high humidity can encourage the growth of fungal diseases that can damage the crop.

Option 3, which mentions humid temperature and moderate rains, may not be the best conditions for wheat cultivation as high humidity can still pose a risk of fungal diseases.

Therefore, option 4, with moderate temperature and moderate rains, provides the most favorable conditions for successful wheat cultivation.