Which is the topic sentence of the following paragraph?

On the day of my piano recital, I was experiencing nervousness. I felt as if grasshoppers were jumping on my skin. Although I had been practicing the waltz I was going to play, I was afraid the worst would happen. As the day wore on, I grew increasingly fearful. I couldn’t concentrate on anything until the moment of my performance finally arrived.
Question 18 options:

a)

As the day wore on, I grew increasingly fearful.

b)

Although I had been practicing the waltz I was going to play, I was afraid the worst would happen.

c)

On the day of my piano recital, I was experiencing nervousness.

d)

As the day wore on, I grew increasingly fearful. I couldn’t concentrate on anything until the moment of my performance finally arrived.

Julius caesar. [brutus.] with this, she fell distraught, and, her attendants absent, swallowed fire. cassius. and died so? brutus. even so. cassius. o ye immortal gods! [enter lucius, with wine and taper] brutus. speak no more of her. give me a bowl of wine. in this i bury all unkindness, cassius. cassius. my heart is thirsty for that noble pledge. fill, lucius, till the wine o'erswell the cup; i cannot drink too much of brutus' love. [exit lucius. enter titinius, with messala] brutus. come in, titinius; welcome, good messala. now sit we close about this taper here, and call in question our necessities. cassius. portia, art thou gone? brutus. no more, i pray you. what moral dilemma does brutus confront in this excerpt? brutus lets go of his anger toward cassius and forgives him. brutus decides that he will not mourn portia and will stay loyal to cassius. brutus decides that he is too angry at cassius to remain friends with him. brutus questions whether cassius's life should be ended.