Choose the correct option

[a|an|–] apple

[a|an|–] banana

[a|an|–] train

[a|an|–] sandwich

[a|an|–] carrots

[a|an|–] park

[a|an|–] umbrella

[a|an|–] biscuits

[a|an|–] orange

[a|an|–] T-shirt

[a|an|–] tomatoes

[a|an|–] bathroom

[a|an|–] grapes