Hello! A basic Spanish sentence would go by subject,verb, object.
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Esa vez que viajé fuera del estado fue para ir a México, tenía 10 años y fui a visitar a mis abuelos en Guadalajara Jalisco. Hacía mucho calor porque fui en mayo.
The answer is
La revista Cosas es mi favorita. ___La compro_________ todos los meses.
The female and singular pronoun <u>La </u>is replacing the magazine (revista Cosas) which in Spanish is also female.
the other options do not apply because:
<u>Lo</u> compro is male gender
<u>Las</u> and <u>los</u> are for plural and the sentence states only one magazine.
Its false because many tourists visit there than other places.