Identify the sentences that have 'adjectival phrases':

(A) She dance skilfully.
(B) She is a skilful dancer.
(C) That was a thoughtful act.
(D) He acted thoughtfully.

Choose the correct answer from the options given below:

(B), (C) Only

The correct answer is Option (1) → (B), (C) Only

We are looking for adjectival phrases — phrases that describe a noun.

(A) She danced skilfully.
– “Skilfully” describes how she danced (verb).
– This is an adverbial phrase, not adjectival.
– Not correct.

(B) She is a skilful dancer.
– “Skilful dancer” describes the noun dancer.
– This is an adjectival phrase.
– Correct.

(C) That was a thoughtful act.
– “Thoughtful act” describes the noun act.
– This is an adjectival phrase.
– Correct.

(D) He acted thoughtfully.
– “Thoughtfully” describes how he acted (verb).
– This is an adverbial phrase, not adjectival.
– Not correct.

So, the sentences with adjectival phrases are:

(B) and (C) only.