Explain the relationship between a noun and an adjective in the singular masculine and plural masculine form for adjectives that end with an o

The noun and the adjective are always both plural or both singular and are always both feminine or masculine depending on the noun

for example: Yo como la manzana roja. OR Yo como las manzanas rojas.

the first sentnce means I eat the red apple and the second means I east the red apples.

Explanation:

eso es

y ahora me estoy dando cuenta

the right answer is c. tiempos

el partido de fútbol tiene dos tiempos

in english, this translates:

a football match has two halves

these halves cosists of 45 minutes each.   each half runs continuously. on the other hand, there is usually a 15-minute half-time break between halves.