The simple presentence is essentially used to connect two sentences clearly with meaningful or grammatical sentences.
In the above case, it has clearly seen the presence of simple present tense i.e. I want to go to movies, this sentence to be linked with “ I am going to do my homework now”, where “to do” is a simple present tense.
Thus, the options (d), (b) and (c) are incorrect.
In the above case, it has clearly seen the presence of simple present tense i.e. I want to go to movies, this sentence to be linked with “ I am going to do my homework now”, where “to do” is a simple present tense.
Therefore, the correct option is – a. to do.