Which sentence contains an infinitive? Li says learning to speak French is easier than you think.
Marco went to his doctor for advice about his knee.
Mrs. Wilson sent the letters and packages to Charlie.
If she hurries, Lillian will be there by quarter to four.

Li says learning to speak French is easier than you think.

Explanation:  In English grammar, the infinitive phrase is a sentence fragment typically starting with the word “to,” immediately followed by a verb, and then any other additional words to complement the verb. The phrase itself is not, however, a verb. It is very commonly used as a noun, but it can also be used as a descriptive modifier for other words.

the sentence that contains a restrictive clause is a.they decided to meet where the band was performing

explanation:

a restrictive clause is also known as an essential clause

the civil rights act was passed on april 9, 1866 by a republican dominated congress. it was passed over president johnson's veto, in an effort to push back against discrimination of african americans.