Can you fill in the blank?
The major cause _______ the pull of the Moon on the Earth.

This question is related to grammar. The other choices aren't grammatically correct, which is why they are wrong. This question would normally be found on the TOEFL, which is a test of English as a foreign language.

TOEFL is a standardized test which measures a non-native speakers' ability to speak a language. These tests are for those who want to enroll in an English speaking academic or institution. TOEFL tests were introduced in 2005 and were done so in countries including the United States, Canada, Germany, and France.