Which form of gustar should be used to begin this sentence
la clase de historia.

The correct answer is Me gusta la clase de historia.

Explanation:

In Spanish there are the so-called unstressed personal pronouns.

These pronouns serve as direct complement or indirect complement.

Then I will write you what these pronouns are for both cases:

As a direct complement:

                          Singular        Plural

1.ª persona    me                  nos

2.ª persona    te                          os

3.ª persona    lo, la                  los, las

As an indirect complement:

                             Singular    Plural

1.ª persona       me            nos

2.ª persona          te            os

3.ª persona        le, se    les, se