Mi abuela sesenta y ocho años. a. tiene c. tienes b. tengo d. tienen

Tiene is the conjugation  of the verb tener for the third person singular in the simple present tense. We use this tense when talking about habitual actions or routines. This tense is also used to describe things that happen now or in the near future. So this sentence can be written and translated as follows:

Mi abuela tiene sesenta y ocho años (My grandmother is sixty eight years old)